Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f05a858717f006d…

MALICIOUS

PDF

72.1 KB Created: 2021-02-21 11:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d993cf51f2744f0536935ea69964024 SHA-1: d4c458671d0fdaa2ff9cc00b03bdd7c2639a883a SHA-256: 5f05a858717f006da76642f4981742163b530189ab7e8eaeb78719bc24042268
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=what+is+management+by+objectives+system PDF link annotation
    • https://cdn.sqhk.co/naxupowu/Wiggdhe/the_game_of_life_rules.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/2140578.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/transunion_free_credit_report_mail_in_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481168/normal_5ff5bdd6307c0.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/aicghih/virus_war_98k_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_6026be5c4698a.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/noxaw.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/sufoxobaze-zixubagodimibev-raluzo.pdfIn PDF document text
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/628980.pdfIn PDF document text
    • https://gunutusubev.weebly.com/uploads/1/3/1/4/131437775/05c269d44506.pdfIn PDF document text
    • https://zezodejesamibiz.weebly.com/uploads/1/3/1/1/131164097/8ab66cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_6032016f86767.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/d697626fea5.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/woduvurapiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunaraxanoxun.epizy.com/khmer_math_book_grade_11.pdfIn PDF document text
    • http://falafujofubopes.rf.gd/body_organs_functions_worksheets.pdfIn PDF document text
    • http://ribibepope.epizy.com/32667186907.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/64693297212.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/23591731894.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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 5476 bytes
SHA-256: 98750005484a457cb9d72f956e621a388e08994b8e1349add7995daf7903cd33
font_01_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 9708 bytes
SHA-256: 03bf4a15d51b15c037f73157a1416f04cb3b47b05adec44f071bc3348e8130ea

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