Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7c32c0074589a5…

MALICIOUS

PDF

99.6 KB Created: 2021-02-15 17:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ca46a3243dc861b7af45747a02205bb SHA-1: d3b7b959f99e25f8272ed08a21b80a42401ff963 SHA-256: eb7c32c0074589a592ce4ea2e512044caf8e099d1f7a418d7be95b65d6881eec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or traffic-generation scheme, likely delivered as a spearphishing attachment.

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://crophysi.ru/123?utm_term=inteligencia+emocional+definici%25C3%25B3n+daniel+goleman PDF link annotation
    • https://cdn.sqhk.co/temirikuji/v1iaiiR/spirited_away_netflix_us.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/fgejfgf/momilibewaropuzuresodasow.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/cjdr7zL/motorcycle_wallpaper_4k_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/CgikijN/mubagov.pdfIn PDF document text
    • http://rutopadazemed.22web.org/11228364787.pdfIn PDF document text
    • https://fopabitibomasad.weebly.com/uploads/1/3/1/8/131857723/5258306.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/zSuVje6/fresh_fruit_cover_photography.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/egh3ieW/nasa_asteroid_warning_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5ffea466b3a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fe5b446f1214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fc65fc2e13e7.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/61515951312.pdfIn PDF document text
    • https://penusifobituje.weebly.com/uploads/1/3/4/3/134314418/988485.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabewoz/Qichgjj/kuvamutumulapibesijodudew.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/defd7803acb8.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/eigbpKg/cake_decorating_kit_hobby_lobby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wozawexopad.epizy.com/clinical_practice_guidelines_for_emergency_nursing.pdfIn PDF document text
    • http://vinetewexe.epizy.com/datasheet_arduino_mega_2560_r3.pdfIn PDF document text
    • http://pisexudovekozus.rf.gd/texatatisajaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 4928 bytes
SHA-256: d5553267fecc391987780110a0c4e6ea2c5050a3b6545cd3e8c8050dcdf042c0
font_01_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 11988 bytes
SHA-256: 3ad9943e38d3844f65c8511a4426b65c411019fad6c30a561c5caf1c808ed953
font_02_sfnt_off00017004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17004 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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