Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dec5759d6f3191…

MALICIOUS

PDF

77.5 KB Created: 2021-03-28 21:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 86c356348c20615502eee1d9b845b2ed SHA-1: 6e8841845f71e8a58864cc6608aaa5fe95246596 SHA-256: 31dec5759d6f3191c1b3555952b8d670059e14ee5a9d622f3f8b30f5d0e8271c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt 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://xezojetit.ru/award?keyword=new+canada+food+guide+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/xamowizaso/ebjf8ig/40456046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_602eaa97d459f.pdfIn PDF document text
    • http://xevamaz.iblogger.org/elm327_obdii_android.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/rafegu.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/2821006.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/cjgRidh/vebeve.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/sujanek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_600dc54daeeb7.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/58433431374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a84f34-30b8-4c4c-be01-ad7a52e31f5a/66387142689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb66f54f-3e8d-4bdd-b5d3-09337533d8ec/ck100_key_programmer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4d168c-74f2-4fe3-918d-e847b2671552/gilles_deleuze_postscript_on_the_societies_of_control_summary.pdfIn PDF document text
    • http://wabawepa.rf.gd/medical_english_dialogues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7907ce2b-b272-4c02-ae72-3c20c33b9c0c/bufulijad.pdfIn PDF document text
    • http://serivisaruwe.epizy.com/dd_underdark_battle_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b29b843-6e49-4a95-9f93-d227647825aa/how_do_i_stop_my_first_alert_smoke_detector_from_chirping.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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5352 bytes
SHA-256: 2c5e017e26ba91beb9d397c6b53333615019a31d99341021905379279e1f3e1a
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 11156 bytes
SHA-256: 3a3547b3a539a6f0395e3df0b6961fcdc54482128473be35e71cb94cbe8794c1

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