Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a644166e51679d0…

MALICIOUS

PDF

69.7 KB Created: 2021-01-14 11:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f61775f1da7da52981855526ce5efd0e SHA-1: bb1cb01a9c5bd3402360c52d8adc374e9cec2d77 SHA-256: 1a644166e51679d0b0ccfe16060b213e7ce15c48b93f0920cbeaaf97d6808a14
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=bascom+turner+gas+explorer+manual In PDF document text
    • https://cdn.sqhk.co/tusumawibe/pjgPJwS/64351453119.pdfIn PDF document text
    • https://site-1171628.mozfiles.com/files/1171628/spellspire_xbox_one_achievements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f933b1a48849.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/g0rhhfN/tofu_girl_ad_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5fc60f8624ec0.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/Zijiji7/primitive_skateboarding_sailor_moon.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/azieZhe/red_balloon_song_download.pdfIn PDF document text
    • https://kaseledewa.weebly.com/uploads/1/3/2/6/132682802/762130.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/beturixudovu-fuserepid.pdfIn PDF document text
    • https://gizuxafonot.weebly.com/uploads/1/3/4/6/134619773/kokiwuvapirepeguwole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_5fd8ce4f9d5e4.pdfIn PDF document text
    • https://juzumefewuw.weebly.com/uploads/1/3/4/7/134766708/towefupej-jowuponelawoxe-rojuxusupel.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/8644275.pdfIn PDF document text
    • https://site-1168222.mozfiles.com/files/1168222/occupational_therapy_assistant_schools_in_oklahoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 5204 bytes
SHA-256: e0cbfc8153c4a3fdd6889a11be49c54e88753ef4e1c9877a7a93d89cd8983804
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 10672 bytes
SHA-256: 77213d28c49e029f2b8ee5fc41c964771d7fe97aebe98e8a349314cff4bce684
font_02_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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