Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaf2a0ab3e7c921…

MALICIOUS

PDF

76.1 KB Created: 2021-04-30 19:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a85ad90f1df4941a9a445a06f32e76 SHA-1: a57eff9d7c33676820fe244b90e798842f466304 SHA-256: 3aaf2a0ab3e7c921f1f38c416e1350f1f0eed103be0ccf0fb2e2cd86bdf19d66
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 academic or literary content, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=a+doll%2527s+house+full+text
    • https://cdn.sqhk.co/dagosasojo/pjagcNN/36902039438.pdf
    • https://cdn.sqhk.co/vidikusupegu/he7ghgc/entrepreneurship_articles_2015.pdf
    • https://cdn-cms.f-static.net/uploads/4379231/normal_603c55990a644.pdf
    • https://cdn.sqhk.co/razonavari/cjjjcjb/kozelesod.pdf
    • https://cdn.sqhk.co/dofexoxev/M3gfggi/debamovuxobodi.pdf
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/41010201d72c19.pdf
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fe8e2ff2ee4a.pdf
    • https://cdn.sqhk.co/jotenitix/g1dhjzm/fitbit_charge_4_deals.pdf
    • https://cdn.sqhk.co/nojedevatas/3jjEejc/earth_online_live_world_webcams_cameras_pro.pdf
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/684767.pdf
    • https://cdn.sqhk.co/sapidefapo/dioigU5/81723365109.pdf
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/lenefafazapifuke.pdf
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fe5df350b5cd.pdf
    • https://cdn.sqhk.co/dojidavos/Zjggehi/world_history_chapter_27_quizlet.pdf
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/8316c8acb88.pdf
    • https://cdn.sqhk.co/mugolino/hdGMgcN/kekidojimunefetemal.pdf
    • https://static.s123-cdn-static.com/uploads/4391636/normal_5fecf9505e2aa.pdf
    • https://cdn.sqhk.co/xusarukave/xjbjhvr/musojolilolegeramami.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vajefam/sebanopek.pdf
    • https://s3.amazonaws.com/lekezaru/why_did_harry_get_rid_of_the_half_blood_prince_book.pdf
    • https://s3.amazonaws.com/jakujakula/54015615371.pdf
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_baa8e229a78f443bbe230cbb34159e34.pdf?index=true
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_58480197e12d45eaa6ffb01fe07c1769.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5c.bin
3f63d9076b799fb66e1ae31f4b349f686cae1c739bc653754df4fbce81654ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 4780 bytes
font_01_sfnt_off0000feab.bin
5072991cd7920658acf013bf0401e2c1ddabafc005127c5eea07d33736f2acfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10632 bytes

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