Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f9aef191fbed7f…

MALICIOUS

PDF

71.0 KB Created: 2021-01-28 10:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ff011bb1884b44ce7650c5d86d9b4217 SHA-1: dc755b1faa7a07c3fe3b30b78243d4347d0046df SHA-256: 51f9aef191fbed7fb8343208edf70c2d61a52d2310197d116414077f48eabd91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=candles+in+fireplace+decor PDF link annotation
    • https://cdn.sqhk.co/rutunidosaw/jbgeYja/52608340196.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/xggyhjz/5673146327.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/hiaOgiI/troll_face_quest_unlucky_level_28_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/jfidghk/80478405713.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/raxotimosofitexipo.pdfIn PDF document text
    • https://gaxipisida.weebly.com/uploads/1/3/4/2/134267022/luditir.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/nulomulupebatomapepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_5ff02e80e04e0.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/S4Eq6ij/switched_at_birth_bay_assault_episode.pdfIn PDF document text
    • https://tidixusega.weebly.com/uploads/1/3/1/3/131380021/4bd4a88.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/kevufanakesadipexaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/9JIPmly/swordsman_vr_release_date.pdfIn PDF document text
    • http://numberoone.xyz/631703187852ggao.pdfIn PDF document text
    • https://jiwejezagaxu.weebly.com/uploads/1/3/5/3/135325467/6c6cf0d.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/jWO5WCy/minecraft_dark_forest_seed_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuxedufexi/njdIijy/xifewisinije.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jbNR8t9/99163442520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 5052 bytes
SHA-256: f75edc087f6a702f932f701c9ae8f4938c3375431bca31074778533a1d400699
font_01_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 10876 bytes
SHA-256: febf65a601d0ccf99818d89f58827b73ea50a475b8dde2f8b645172afd27c79a

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