Malicious PDF — malware analysis report

Static analysis result for SHA-256 300515604f224a11…

MALICIOUS

PDF

71.5 KB Created: 2021-02-24 11:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 21ce94dc77c8b631de06b504a441b046 SHA-1: c66175330008c675bb76bb893e6e2548eead9f91 SHA-256: 300515604f224a11883132e4a7281ba5e7930e4e675b7e09681a88e98fafb082
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wb?keyword=solving%20quadratic%20equations%20with%20complex%20solutions%20worksheet%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494139/normal_5ffcc5a1d15a5.pdfIn PDF document text
    • https://kebekeloku.weebly.com/uploads/1/3/4/6/134639455/3400415.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/iijd8jf/meltdown_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/gekjiyk/cheap_street_basketball_hoops_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/delinilipo/UbNj0zF/applock_fingerprint_lock_android.pdfIn PDF document text
    • https://cdn.sqhk.co/merisipugito/bgkp1bO/mabuwumi.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/jjeogcy/marketing_plan_pitch_deck_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/jgjghjg/people_nearby_are_searching.pdfIn PDF document text
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/282417.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/8jaDie1/21924217743.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/kozozenoriruzumidemi.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/hcjgQje/4600863886.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/jehbIge/gonipogokamew.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/jLygh9A/spiritual_health_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/kjihei3/65738962474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6017bb0a881dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fezenur/drug_delivery_system_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 6084 bytes
SHA-256: 3a2f11468e3f1d03ead3edfbc176ae3b5756789e45f8ed76c4b58b0f22a6c570
font_01_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 10996 bytes
SHA-256: 84f290f69f042d3c011721638ebe812ea354e06f3bfecb1c66573b01c0cb06d6

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