Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b229997c049827…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 00:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d790bfa7e7bb83e8790d32e4e485e56 SHA-1: 5e1f3996ef845c3f29068657d9326e699cf942ff SHA-256: 73b229997c04982760b56a53fc1f6dc37d6b11ff5ab2fbb5586cea9da19d04c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jottigo.ru/strik?utm_term=forklift+driver+training+courses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443819/normal_600da7a92949d.pdfIn PDF document text
    • http://apsmall.space/ringtones_free_for_android_mobile_phonestwy3l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_604fb14cedc6e.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/electronic_distributor_ignition_system.pdfIn PDF document text
    • https://bepifesak.weebly.com/uploads/1/3/4/0/134096259/8556378.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/7e0db8f4134e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fed903dc9fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_603a00c3f3351.pdfIn PDF document text
    • http://politach.com/best_wallpapers_hd_for_androidwu4a0.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/65104407190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_605f313a862e6.pdfIn PDF document text
    • http://pubgmobiie.com/tewosozajyx97p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_603061033f871.pdfIn PDF document text
    • https://weraxugunelega.weebly.com/uploads/1/3/4/7/134719696/3f2800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laganomezavarof.epizy.com/80522773231.pdfIn PDF document text
    • http://deburukibovip.rf.gd/1996_jeep_cherokee_country_parts.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/what_do_the_four_candles_in_the_advent_wreath_symbolize.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_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 5268 bytes
SHA-256: c24bbcc4616bf67e87f7efc25cccc5d6baeb68abda210d0a01ccdf352d875f65
font_01_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 10912 bytes
SHA-256: 7a99f976c8064edabda87a6645869be9164d9df3129bace367bc8625b782ca12

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