Malicious PDF — malware analysis report

Static analysis result for SHA-256 6447ee19e3563b50…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 10:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 96356641172dd77b6120bc0e90c46bb7 SHA-1: 542b41129f9409c4188194ba5fd127b5090559db SHA-256: 6447ee19e3563b50af1ff5c44d6549b99909bc5177e49ab76df111d1c2109e2b
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, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=st+agnes+cemetery+greenport PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fd11a05a1440.pdfIn PDF document text
    • https://dexuruxewiripo.weebly.com/uploads/1/3/2/6/132682754/79afe7.pdfIn PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/7865e0.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/xibiguge.pdfIn PDF document text
    • https://kogexabisuzim.weebly.com/uploads/1/3/4/3/134322867/881517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_6036796e9e889.pdfIn PDF document text
    • https://busajivajikiguv.weebly.com/uploads/1/3/1/3/131384407/74fd17e1f1c.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/9865407.pdfIn PDF document text
    • https://bipusisep.weebly.com/uploads/1/3/0/7/130775903/8480263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381291/normal_5fce474706c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_603f18277f64c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54088277-1f6f-4c2c-9b51-face605baf49/56643086568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee115e0e-d629-49c4-b278-86036a50a2ef/wotiwuxokatagekomodaferu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8336e4-032c-4db0-a6e1-b0b58a2f18e9/20828608470.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/convert_to_excel_spreadsheet_with_adobe.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/68135403686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c569f82-2ffe-4e6c-b4d0-2ed6a87f1dd6/harmony_700_remote_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/grade_10_english_textbook_ncert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64776c15-0745-4569-a0b9-89d1c7b8294e/vomezosif.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/credit_analyst_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/cheat_code_gta_5_pc_weapons.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 5428 bytes
SHA-256: e3a43f6ae3fe26f409841ec6449f48f3547d6fb74b5d09c4c69d8e55eb2247aa
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 11176 bytes
SHA-256: 6d115918444ff01729f6bda2e5c39125deb8b0ade6f5d51c8bb827f26bea6eee