Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ce9f735928716b…

MALICIOUS

PDF

82.7 KB Created: 2021-06-02 13:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad7789cd2d9b53287b1764e8eea1b480 SHA-1: 751a6317b356adcdb0653d366b0ba107635732f3 SHA-256: 16ce9f735928716bd38a9ec34d5f1bc8032e6c34bd6e0d26c9cfc376c7459529
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coretry.ru/pbw?utm_term=solar+system+picture+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464056/normal_600becabac29e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60160b1600bb8.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/ramasoseref.pdfIn PDF document text
    • https://gevupuwelado.weebly.com/uploads/1/3/4/8/134894118/1210761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382618/normal_5ff88ccfe3fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_6063d091f1514.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/2634641.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/5426715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_606b7aa1d2cf5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403557/normal_60afffe0bb6fb.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/99396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_605bbcc93c7d3.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/foriwavixezowek_kapaguvu_zemimaniwewa.pdfIn PDF document text
    • https://bomoforelad.weebly.com/uploads/1/3/4/0/134012732/kogojaragazoj.pdfIn PDF document text
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/2780241.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
    • https://uploads.strikinglycdn.com/files/0dfadc81-294e-42fd-9413-5d68742f97d8/42954312611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7c6d24-9a30-4da2-b3d9-78d897d80f34/michigan_sportsman_forum_elk_grove_village.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a467700d-6a27-4fce-9171-8411c66118ae/farajozivetumazozobujem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7401d0a-76c3-4994-90d3-d6f26a233d6f/98431876900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d239a996-bd53-43de-bddf-a66bae0a0d3e/download_monster_legends_mod_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e874b5-b578-48ed-bca5-15f4424ce068/storyboard_project_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3705d3-0ab5-4a93-8b34-2acf29cfb779/27866178457.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 5264 bytes
SHA-256: 070f969ea9d30a6991b18987c5c7113e5505463b7e7805c3ab746867a28ae64d
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10396 bytes
SHA-256: e6a27433816a8c2d19a08f89371d019403a533667521c05720e3abe703f72697
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230