Malicious PDF — malware analysis report

Static analysis result for SHA-256 8041d6259eb1fd9d…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 00:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc74238a08cfb7f2aafde95220e0844c SHA-1: b59962ff4092859030c5fbc28271e80f8d3bb8e2 SHA-256: 8041d6259eb1fd9daeaf25bf32bba76361531b9eabc32a1602f4f3329cc6604d
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 0.9998

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://xajibur.ru/award?keyword=catechism+of+the+catholic+church+simplified+pdf PDF link annotation
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/0a955e81bb1.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/Yp39iem/subterfuge_game_specialists.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/ijh7TCZ/espn_fantasy_sports_api.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/8MjfieN/92401857960.pdfIn PDF document text
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/denin_paruvav_virimefub_fofejusuju.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/grad_der_behinderung_tabelle_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/heCjggh/38758877839.pdfIn PDF document text
    • https://bopuwivotapupo.weebly.com/uploads/1/3/4/7/134745193/zilulifef.pdfIn PDF document text
    • https://zemexiwum.weebly.com/uploads/1/3/4/3/134330210/c4fee88.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/jh1gfji/horizon_camera_controls_unavailable.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/clinical_cardiology_textbook.pdfIn PDF document text
    • https://wixexiwe.weebly.com/uploads/1/3/5/3/135316610/aa6012e0bb77f05.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/bjhP6nf/granny_chapter_two_escape_mod_apk.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/noxiluba-rifafefav-gezesudu-jemonewepig.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/aidaR3j/3569808910.pdfIn PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/84bb264eea7d91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_e3e364a5b88f451c90f8a85547a70333.pdf?index=trueIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_d403f16753d542508c66e818008d6200.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_bfb677f8edeb4354ac5baf52de024e4c.pdf?index=trueIn 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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5300 bytes
SHA-256: 0a2a61766216ab6fa66d3bc2056402cd269a20b5c4d20f6f166fd438f8911450
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 10808 bytes
SHA-256: fa8f28ccff0944753ce46a8b62297065a6815665bc9ca20076b19e74ae7c6830

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