Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4431aeae2c34aa3…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 19:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf39efc261f048127c373d5485492b1f SHA-1: c8b29e5e296bb4364de72d65a5bafc0740394843 SHA-256: d4431aeae2c34aa3791d8f5d4d4424befa2b1cc5657f8fe2ab9bc1251e3cc497
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various external resources, some of which are flagged as benign but others are unknown, suggesting a potential distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://maypoin.ru/wix?keyword=pennzoil+filter+application+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6021cdb11b26c.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/51054301895.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/gjprd1X/unfollowers_4_instagram_check_who_unfollowed_you.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomadu/f2gi7Su/conducting_polymers.pdfIn PDF document text
    • http://zaxanoxejem.iblogger.org/5842336767.pdfIn PDF document text
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/mezufatinuregumiwuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_604dd48b3590b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fec3c9c9c736.pdfIn PDF document text
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/6492570.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/15f0517b.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/tufafaligezoza.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/jrDic2i/pearl_jewellery_store_near_me.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/jurnal_obat_antasida.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/f4dae75ad374bda.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/tekogogabijegile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5ffc6407b9619.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/aSjizjf/gmail_attachments_in_bulk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_60469a4d80ce9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://monazureme.epizy.com/50350718048.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/64945175521.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_44a987549f4543ab9229fdd8822a6f7f.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_c5d9dba4bf964f6387c1b30205f94549.pdf?index=trueIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_7782291f04db49ae946049d904528068.pdf?index=trueIn PDF document text
    • http://julukawava.epizy.com/air_pollution_control_a_design_approach_4th_edition.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_ba7cd4ceb0f742329b43607f5ed0b7b5.pdf?index=trueIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_4fcd24bfbb454deeb97f49abcc1029e1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5196 bytes
SHA-256: c9807d6fd8cbb3d1467b8dba2db5de2b2daf8c5896f23ed4fa59f1dd63ccb53e
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 11284 bytes
SHA-256: 0f36f7a00766f03c875f462e22a06bca9a5565e3843480f88d91bf3bfab24094

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