Malicious PDF — malware analysis report

Static analysis result for SHA-256 36708282ec344805…

MALICIOUS

PDF

89.1 KB Created: 2021-04-19 12:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b57533257a14f268ee33d69bb85808c1 SHA-1: cfa5e80735bd3ab5c13c766bdec8d76c1ef81c9a SHA-256: 36708282ec3448050e3890d30cc349bcc9b0ce2a89b83999c3ab3b5726f52946
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous heuristics indicating malicious intent, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK, pointing to a URL that appears to be a phishing lure. The ML classifier and ClamAV detection strongly support the malicious verdict. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to a potentially harmful site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/strik?utm_term=my+husband%2527s+secret+wife+synopsis PDF link annotation
    • http://helpcenter.business/niwumezdgz74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_600eccf7af089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_6049d817cd026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_5fe7f6dcf261d.pdfIn PDF document text
    • http://geekcods.com/army_jumpmaster_nomenclature_study_guidevfkck.pdfIn PDF document text
    • http://stonersfranchise.com/wupalaxenu06hfh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1f155014-1e6f-4189-ab95-3679d9c2160a.filesusr.com/ugd/9b7d8a_cdcc4f38c2d7406883f1597472301c66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe2c247-4264-4820-9019-70a4a8138760/1668129105.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/25097831362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9970e02-1c8c-4aac-89d8-9f5f22247fe6/pawolivogamogajepewam.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_31d51463dadf437c9315d5fd97568153.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/navfac_design_manual.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_29c42d2c0e4b4908996e208beb526770.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_fbce7b3d20c740ea9a16a9fd5a810a11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe66f235-7c2d-49f4-8f29-10fca5bc0f57/fisher_price_deluxe_infant_to_toddler_rocker_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/personal_career_development_goals_examples.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_70b632b903e3426da5e790d8e13a889b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2459961-aaa6-4b94-83e7-37766557f22e/jasekubitimawar.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/where_is_the_filter_on_frigidaire_affinity_washer.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_463344e7615b4f1490688b524664e1fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/static_and_dynamic_scheduling_problems.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_e3c82d0cd0b342a29963dc160bbad44c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 5584 bytes
SHA-256: 79926a651b69cc9d3ef5cfca0a4f31ddb8c417a41fa7efa1375d57a02e3f3a8e
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 2516 bytes
SHA-256: 5d39df1d1a4f0c97b00e7c298448fe88769cc1223bee4ce96628162ae5d54b3d
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 11336 bytes
SHA-256: 2f112c5af192ea33f4005bea2f24caf8d600fa80257bacd0292ae7925a9455b0
font_03_sfnt_off0001406f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406F 16344 bytes
SHA-256: 3745d395dffe053ce12bb6e6d543a89fda750690c61e1e786fb35984b58e44e5