Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42e2affa885ac06…

MALICIOUS

PDF

98.9 KB Created: 2021-02-28 22:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c1455555fafc8a02ecf20417a97425c SHA-1: df3d62341e94f366951a43a7582b5af1e1328f87 SHA-256: f42e2affa885ac068eff87c3cc4f6e978c3f5de5e87b73ec7f95f825e46e1abc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+to+say+thank+you+for+prompt+reply PDF link annotation
    • http://ita-women.space/zokupumijgoyj.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/2907169.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/fhhhgxO/dorapadomelulogeki.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/SGhhmuw/us_army_officer_ranks_insignia.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/23776962856.pdfIn PDF document text
    • http://lastasked.com/47545570280avqmx.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/is_wendys_spicy_chicken_salad_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/bfZKKBt/55697855343.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/djiiiV2/nonirevebozoxuvirejudem.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/debofura-fimejelijawerum.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/what_are_the_six_major_elements_found_in_living_organisms.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/xjjhgjh/icy_veins_resto_druid.pdfIn PDF document text
    • http://pudumumununi.22web.org/1436739092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogivumomu.epizy.com/school_age_lesson_plan_template_for_daycare.pdfIn PDF document text
    • http://botibaxar.rf.gd/67828581700.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_off00014587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14587 5360 bytes
SHA-256: c05b18fba226887738b654551c48c6a0a81f18461c1e08d515c4b9d270391dcc
font_01_sfnt_off000157b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B1 11732 bytes
SHA-256: 0a07ca1071fbc676a2173d27a5d80b781cdc771f559d3e977406533463566ae1

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