Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6cd0c235f6a374…

MALICIOUS

PDF

81.5 KB Created: 2021-03-11 14:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 67cefec8086d9d8d1ef87ede60f2b934 SHA-1: d885172499603c6e68c52e7511c459ed1791f3a1 SHA-256: 0e6cd0c235f6a3746f48631eafeefabadbd0de915efec81342544f4082c8ac0d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=we%2527re+going+to+party+like+it%2527s+your+birthday+lyrics PDF link annotation
    • http://uscarins.info/the_cat_in_the_hat_knows_a_lot_about_christmas_traileri7dzz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417025/normal_600206e684b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_6023952852eaa.pdfIn PDF document text
    • http://varnisvakq.ru/sodufivumumagigozaro0ngcj.pdfIn PDF document text
    • http://zoosalon.org/titojixolejvcdw.pdfIn PDF document text
    • http://fitness-ital.fun/wilovemmzg8u.pdfIn PDF document text
    • http://gbo.guru/8664157361246he4.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/6268039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_5fdbc896f0d92.pdfIn PDF document text
    • http://flymoney.net/after_book_series_parents_guide269un.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/muvofuziket.pdfIn PDF document text
    • http://wonder-ita.space/61704369810i4oiz.pdfIn PDF document text
    • http://xrootunited.com/14467662552x6jki.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/nonizipijutepev-towuxazefega-ruzil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_603ac93fba6ab.pdfIn PDF document text
    • http://cardioactiveuficiale.site/logo_brand_style_guideca2ue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_603b434a10dca.pdfIn PDF document text
    • http://study-english-05.site/54494733692uj6q4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_f6afb21b74ab40dfa76c545fa95b4312.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_61f697d9f0a147b4a0263555d98f0f96.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_8827d9a942ac478494914be9f16e07a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipinib/class_9_moments_chapter_5_question_answers.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_daf2cbfbc1564fb1b3c2625c8df38602.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_63141a856a9b4ab0960e25ffa0cc69b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/rutivoposokubevu.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_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 5688 bytes
SHA-256: 57c4a8642c63e80e417bca98fb11983511d98c45178afb6ed4a001a723ac5fb7
font_01_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 11340 bytes
SHA-256: c17bb0a323ba221f324511847b00c60c7bde132b2ad0fc21656dbf99a2b14687