Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f40902cfab88759…

MALICIOUS

PDF

79.8 KB Created: 2021-05-13 18:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c547ee726a2774a47fb303afc089f43 SHA-1: 2bfa731226e1fe96876ad88e58ab1773ae680b0f SHA-256: 0f40902cfab887598be1f7e6e4c7d99760f36bd61a2ec6fc288ce57710a47622
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one leading to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and heuristic firings indicate it functions as a link farm, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=lg+truesteam+dryer+steam+fresh PDF link annotation
    • http://wersita.fun/fujesujosesesor76anm.pdfIn PDF document text
    • http://maxist.ru/omron_h3cr-f8_manual_espaolhvt1m.pdfIn PDF document text
    • http://mastera-saydinga.ru/kabozifuvijimuxeropigufuxiqzdy.pdfIn PDF document text
    • http://italy50wow.pro/48916106807ul7x1.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/basic_addition_and_subtraction_worksheets.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/bayesian_network_example.pdfIn PDF document text
    • http://skidki-day.site/89688432588juhu7.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/gibulatapetexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_bc40a7608a5d41019a24b2d37ac03442.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/bepotixixosalomuweka.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/annex_10_volume_3.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/poluvakijosarabizanex.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/wow_classic_horde_alchemy_leveling_guide.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_47d62e77004b4044b214792bceae8891.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2b6be1-39e9-4823-8fcc-54a42c020f53/80256706866.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/1419666574.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_2674e3179bbc425f94336a05ef6d9aa8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ee1d86-d5e1-4551-b888-d5f87d8ea1fc/how_to_calculate_debit_credit_and_balance_in_excel.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_2d950490abfc43c081170a370f88f554.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 5332 bytes
SHA-256: de114ba8386a91bd949aaf597ba6a53d3d4c37f1c15d02393c20415f4578ef60
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 11236 bytes
SHA-256: 4429f461755a36d61ed6d59d494557da11531f9d2646e6ca4b6766e1ba289e42
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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