Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28357b79107c67…

MALICIOUS

PDF

73.2 KB Created: 2021-03-30 06:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c15f23d441df062c0f82617aced4d1a2 SHA-1: 8740c580a932bda720e5093ee71553ad6978e9fc SHA-256: 5f28357b79107c6731f7553dcfc4b4f0955737ef8e6da72ffbf45b76c7ec2141
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=types+of+variables+in+research+pdf PDF link annotation
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/8650626.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/iekGCia/98965847228.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/69jiqgv/rpg_maker_sound_effects.pdfIn PDF document text
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/572047.pdfIn PDF document text
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/xefek-bariti.pdfIn PDF document text
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/59467b876.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/white_rodgers_1e78-144_reset.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/simufevaduxopugewu.pdfIn PDF document text
    • https://xexewevifiwewol.weebly.com/uploads/1/3/6/0/136054804/mepen.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/doterra_price_per_drop_canada_2020.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/cms_my_talent.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/H2piigf/34001555355.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/fja2ihI/cruise_ship_stock_market.pdfIn PDF document text
    • https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/933473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_ac7430201d304c4d8c5f4ec5fe081033.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_edc2662f0d1d41bf8fa28861f2f7b404.pdf?index=trueIn PDF document text
    • http://fiforeru.atwebpages.com/15367464871.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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5496 bytes
SHA-256: df16d95e9c95319ae3eb8f0ceaf9d2aa3c8de7f1e36cf2615aee1cf0ed1d9d9f
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10728 bytes
SHA-256: befb4a536ef63f5e4a06994bbe3305095ffe185eec8a84cb3b3564d19494db2e