Malicious PDF — malware analysis report

Static analysis result for SHA-256 6288407b9ca92e03…

MALICIOUS

PDF

88.4 KB Created: 2021-03-16 15:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f80da6b77b4891ae6c34f181bbff594d SHA-1: 50af3cbae1beb9a35a485b7302243e3a833c4076 SHA-256: 6288407b9ca92e036840be80989fc03ab9581147298bca9ca4df6de25db1d042
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 0.9967

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://golowaki.ru/award?keyword=un+barrage+contre+le+pacifique+pdf+gratuit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375197/normal_601a876edc5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_600aa0d44ab4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_5fd61c3d6b19a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_60128108602ae.pdfIn PDF document text
    • http://front-glass.website/yellowstone_season_3_finale_recapzjhdq.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/jozosamoxijurazofi.pdfIn PDF document text
    • http://atelier-spb.com/kuwomojalowezusadalu2pto4.pdfIn PDF document text
    • http://reduslimitaly.website/925151572536yjjd.pdfIn PDF document text
    • http://coins24h.com/saeco_coffee_machines_pricesf2mn9.pdfIn PDF document text
    • http://grandov.pro/ajzen_i._1991_theory_of_planned_behavior_organizational_behavior_and_human_decision_processesw7214.pdfIn PDF document text
    • http://spoonnumberone.xyz/86045556134reqg3.pdfIn PDF document text
    • http://thedouche.xyz/summer_infant_camera_monitor_no_signalf19mo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_6001224ef08cd.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/732812.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/webuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_6008a1c7aed1b.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/nosedi_mowemubewavakam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_60145fda860bf.pdfIn PDF document text
    • http://autocredit.moscow/vezozajuni7ezq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fd93ef3859fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_602c73b37e27e.pdfIn PDF document text
    • http://ewwe.space/afcat_answer_key_20189kyrj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_60118f590042b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/meludav/pomurinilogof.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/verb_affirmative_negative_interrogative_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/introduction_to_calculus_khan_academy.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/zezowemesot.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_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 5404 bytes
SHA-256: e9c1a4ee2880089477fc6924a567bef62d14f0b68e4571cc80737b70de7fb6c6
font_01_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 13128 bytes
SHA-256: 7e6187cf8a7c90ce00f1e45ac85505c024631aefbbc5516a8f6de8bc8f9a8317