Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf44570e5b0e52f…

MALICIOUS

PDF

87.3 KB Created: 2021-03-11 18:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a4994d0fa76539bd2fd55d4d8dbbd7f0 SHA-1: 145f358bc2b03b41e49416a2440a6c1a6fa57341 SHA-256: edf44570e5b0e52f22e9da773c8193342251abdd95cf7362059a5bc7721cfa8f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to other PDF files, suggesting it functions as a link farm. The presence of numerous disposable domains and the structure of the links indicate a potential SEO manipulation or distribution scheme for further malicious content. No scripts were extracted, and the document body was heavily obfuscated.

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://soxebez.ru/123?utm_term=grade+6+classification+of+living+things+worksheets PDF link annotation
    • https://cdn.sqhk.co/kelifevaz/hDihGhd/mountain_bike_racing_top_motorcycle_racing_games.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/personal_development_plan_for_work.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/eQhjbcK/crash_of_tanks_pocket_mayhem_mod_apk.pdfIn PDF document text
    • http://fewesopusilufa.22web.org/redekavunesufiku.pdfIn PDF document text
    • https://fikoroviv.weebly.com/uploads/1/3/0/7/130740338/lixujezadawogi-fikenepurugog-manewaju-ludoki.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/ibggzVT/86296590610.pdfIn PDF document text
    • https://cdn.sqhk.co/fegozanodedu/2hdmgct/zejababil.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/5c3fcab0124d.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/Lmm2pic/terifokotifofamuwogeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_6000a9f012376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_602e327cb95c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_601a2b6473b0e.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/jflhfMi/73179778677.pdfIn PDF document text
    • https://pezefipagezag.weebly.com/uploads/1/3/4/8/134883300/suxilimatej-xiwilimusaxexa.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/18244667574.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/dakananavikora_tizufulu_sibebazowax_jobafagigane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fc5922a2e92c.pdfIn PDF document text
    • http://guwejusu.22web.org/volakaxovij.pdfIn PDF document text
    • https://verikadofaja.weebly.com/uploads/1/3/2/3/132303102/5711973.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/tascam_dr_40_review.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/hggjbib/2553720785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosefiwaniw.rf.gd/class_8_science_ch_11_question_answer.pdfIn PDF document text
    • http://filanovedo.rf.gd/55691918015.pdfIn PDF document text
    • http://roduzafudi.rf.gd/who_buys_college_books_near_me.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_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 5684 bytes
SHA-256: b1ec17820627abbc7c698a2ad9767b4102ed8f9a3935a323902fef7dc3c33ea1
font_01_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 11008 bytes
SHA-256: 0b10a5133b17ed7202bce7765ac06eae97fbd9e4cdc678ea27803172c9e6c9df