Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa2a90eaddb0840…

MALICIOUS

PDF

89.5 KB Created: 2021-04-27 04:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e13dead292356f65273236f3e23973c1 SHA-1: 7875ee01b53fbeb5d68fb18f42085988f0b34756 SHA-256: 1aa2a90eaddb084060988182a078b4d8a4fa11867947a124d396360e386a4130
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by both ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external URLs, with a primary suspicious URL being https://jacksth.ru/strik?utm_term=what+is+steak+tartare+called+in+france. The document body is heavily obfuscated and appears to be a lure for search engine optimization or to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=what+is+steak+tartare+called+in+france PDF link annotation
    • http://jubigale.scienceontheweb.net/mechanical_engineering_objective_book_rs_khurmi.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/how_to_disassemble_polaris_backup_valve.pdfIn PDF document text
    • https://jolofoni.weebly.com/uploads/1/3/4/0/134042869/334c3.pdfIn PDF document text
    • https://wofibenozoga.weebly.com/uploads/1/3/5/3/135321696/6dc78.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/jufojog.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/fokasazav_bubuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/1gdhgm8/restore_duplicity_backup_on_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/duburijudi/cvODhaB/play_klondike_solitaire_games_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f40d890-650e-43c0-8a5e-a937f1ffe2df/18553981402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d4d638-36dc-4a8c-8086-5773da334025/data_analytics_job_salary_in_uk.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/sacubitril_valsartan_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c427dc-a3e6-4d9e-a83f-dc8bcdb828f4/58350892409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012effe9-de3f-4b7f-9a30-5425cbd8293d/35666644718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3a5944-a5c2-4dd1-bd9c-398173a648c0/4878194194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c70d8b-29f6-4af6-ac14-9fbb6001c801/52682551101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2d9a04-be83-4187-807c-1313aa519033/psycho_test_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c73d28-0846-4d52-bd3e-32aa8f3e70e7/xamazaxonifajon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a3629e-8876-43fd-b284-6c5bb916f45c/bose_qc15_headphone_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7e8ce9-f7b3-4763-a555-42b211a74cc7/40202443827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2292bfcb-7bdf-46b6-8216-15c8c59bac21/82835331789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4569b73-c2a0-4fdf-87ed-1edb8e54f984/weird_sisters_rock_band.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/les_bacteries_aerobies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb02c24-cb17-4a7d-8dd5-1efbd7950d23/macbeth_act_1_scene_2_summary_and_analysis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5184 bytes
SHA-256: 68ff29f7792e58d92d650f5e2e30e45673f4cb2df71e0863a1fccfd63e18d854
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 11508 bytes
SHA-256: 37c9ae8d2a32e1db391ab3fdc813142f7908ad257f578a9ab09eb26ffb30f226
font_03_sfnt_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_04_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 2836 bytes
SHA-256: 1e7ec80851dc2a225011dede51e6c116e55b8aa8f5a7a1765d6dcc8f48b050e8

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