Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c536a403b7f4fb…

MALICIOUS

PDF

79.9 KB Created: 2021-05-08 17:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4af43c60006d75a3e2b5ceb64413da0 SHA-1: 16483d8f3f02f59d91854cd78e917a15c43bd94d SHA-256: 29c536a403b7f4fb73219cf4560d6186a32229e0264898584a99e228ed36bf27
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-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://xezojetit.ru/strik?utm_term=human+anatomy+and+physiology+practical+book+pdf+download PDF link annotation
    • http://rifeter.22web.org/40120809804.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/jjcbiea/33083392594.pdfIn PDF document text
    • https://cdn.sqhk.co/vatopibar/Qgi4jjN/green_poop_meaning_toddler.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/L8fuRgg/rock_music_definition_short.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/djwgjQC/eagles_nick_foles_statue.pdfIn PDF document text
    • https://cdn.sqhk.co/valibekarofu/Cjdgjjb/bekhayali_ringtone_mobcup.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/Vhi7qBd/9._explain_how_to_manage_a_business_budget.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/Njdjgcz/4649479625.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/ggVicjd/20134873536.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/hbWtjdH/portland_winterhawks_roster_age.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/73f02fa9-bc47-4054-91fa-e2c30deecb39/22843819893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3db42f-93de-4f1d-8157-10b32d16ce5c/redanopixulimesifovosino.pdfIn PDF document text
    • http://kakarares.epizy.com/58014224796.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_a817fbfde0a74bdab11ef0f273e5a71a.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_2f3150d442c94a32833e4749c1494dc8.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_43ec8a19dea7491a898b1252d36300a3.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_3077604306b947a18d4faea0c29cf21c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 5692 bytes
SHA-256: b849629874ae076e2c57c48f678005a58ed4ae3e7caada18c7cb22b1ec26b3d3
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10916 bytes
SHA-256: 8feaa454c5b65d623e21003f262b3eca0ec44142113bd86069dfc6d1309a4797
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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