Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3efa2751bbf7408…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 08:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f765117fff9184e5c8fb0e25ec2b0b5d SHA-1: 5b54f8016e86fe212680eb5a3fae645b648cbcd6 SHA-256: c3efa2751bbf7408880f31120adae9fc9106e7049b3d31d4ebd17696ee7b51bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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
  • 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://leonvi.ru/award?keyword=maytag+top+load+washer+error+codes+e2+f6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5ffe5ff2ce96e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_601208232f191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_5fd07e8c94bcb.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/2400045.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/bibwia1/52409214957.pdfIn PDF document text
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/43ccd4.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/pgdibGm/national_emergency_alert_system_cell_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/chfZZhi/daninavigelenegowojutubif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fd191285a654.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/jjghhhg/prom_captions_for_instagram_with_friends.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fd6dadddd41d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5ffe77a1ae105.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/iibicJQ/pebexigavumexasudofiku.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/troy_bilt_pony_mower_deck_replacement.pdfIn PDF document text
    • https://wivaralizufijol.weebly.com/uploads/1/3/1/4/131483386/bojapogepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_600fa8ccf3bc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozojatoxako.epizy.com/vubibubarovuzamik.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 5904 bytes
SHA-256: 04b05317e2ac152072ff796c1adb7cb27a77749b18496441aba6821df7febecb
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 10476 bytes
SHA-256: a1cb985f64fa365aaad68d573a8b8fe524d3a174c9244301c5d75ceb9cf506c1

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