Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b345c9ff0d05f6…

MALICIOUS

PDF

66.0 KB Created: 2020-12-28 17:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5c1d7a0fd131248600132d483c93957a SHA-1: 94294125844ad1b531d053f570d441ff01dee387 SHA-256: 58b345c9ff0d05f6f49664d0298c366cddaca31f4bf84964bf576b312cf8761e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'trafffe.ru', indicating a potential phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/aws?utm_term=independent+and+dependent+clause+worksheet PDF link annotation
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/8376428.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5jvaijA/articulos_de_reposteria_cerca_de_mi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fa0f25658403.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/nobazi_vimipufibisis.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/likadojivivofu/super_smash_bros_brawl_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/rurouni_kenshin_2012_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/dofajimivolufelamagoji.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/66828778202.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/cartoon_picture_kare.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/cacing_tambang.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/33368083161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095e43f9-adbb-4026-b04f-d39a57eb3213/academy_black_friday_ad_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/batman_arkham_knight_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/45091955123.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_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 5256 bytes
SHA-256: 3a02ff4bc6463cc738b2ca7948de059e7cd332b4139201f87776d1e92e551ba1
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10000 bytes
SHA-256: fa8556651e460ec91af5e4c8418beefce2b241bd9e4b97440085da61c01a3c60

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