Malicious PDF — malware analysis report

Static analysis result for SHA-256 891781fc67fd6fc4…

MALICIOUS

PDF

100.5 KB Created: 2021-03-22 16:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aea7b4fed2052e7db3049c7b8f7c7259 SHA-1: 1d66d0bfe546ce5b19b4344156912c5142d6e8d4 SHA-256: 891781fc67fd6fc4a6e7c819144e7bdcb2519372f534afb6f58d8b21361d0e8e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=resonance+cascade+physics PDF link annotation
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/gumirakuvetaxo.pdfIn PDF document text
    • http://all-system7.work/36892999927hiqg5.pdfIn PDF document text
    • http://nejuposusim.iblogger.org/big_green_egg_recipes_beef_ribs.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/270a1fcd3c9be92.pdfIn PDF document text
    • http://parkji5x.xyz/coso_framework_for_internal_and_financial_controlsa06u4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/chess_tactics_books.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/aha_guidelines_for_diagnosis_of_hypertension.pdfIn PDF document text
    • http://litegizixusiw.rf.gd/engineering_mechanics_statics_14th_edition_chapter_5_solutions.pdfIn PDF document text
    • http://sefogozi.epizy.com/how_long_to_ignore_a_guy_to_get_his_attention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc20086-424d-42fd-bcbb-a12bf00133da/stealth_cam_g42ng_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a59773-391f-42a3-b46f-874733afbf6e/romamisababekafobibowofip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bad40b5-f5b1-41e0-aea4-4b53549f19de/nazovuzal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c59fe3-c65e-4207-99a2-9e34e977f3d4/3901643265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d5c236-1d4d-4e49-8357-e3875fc89206/what_its_like_to_be_a_bat_nagel_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61da021-d812-438f-98f6-c2e223dd7b52/bokaxepasilejezuwaneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7b3d79-de15-4352-8b0c-8a2429565c99/focusrite_scarlett_solo_2nd_gen_driver_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/dremel_3000_multi-tool_set_set_of_25.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/bitdefender_total_security_2019_64_bit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 5140 bytes
SHA-256: 29e5b1071db841d23c90808574a229b07daaf871014b6772da16d3f7988cf66e
font_01_sfnt_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 13244 bytes
SHA-256: a3b9f8f095a32d625bab22ac8dd6f0d36db527684be08f1f9cc7e06ffd465741
font_02_sfnt_off00016f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6B 16232 bytes
SHA-256: 2231b3e49209ff4059d9cbd2a4b5a39df4464f67091f208a4f47a776ff60dda9