Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ff81ffeff6583…

MALICIOUS

PDF

78.5 KB Created: 2021-02-11 08:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ccb1caf2d3678591e495aca7bb6992b8 SHA-1: 5831fede37f2893a4bc33a8c1b985f57462e6b15 SHA-256: 743ff81ffeff65837b0cbd5f02b6f3daaaa9b21690e94a8f8232612438aca78e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified this as malicious, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites, potentially for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=badminton+history+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fe5f7cf51da0.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/PzKLjid/73193629307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451353/normal_5fe1571ee5039.pdfIn PDF document text
    • https://kigilejujagenit.weebly.com/uploads/1/3/1/4/131438309/6063520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_600ef0e5a56a8.pdfIn PDF document text
    • https://moxusovilala.weebly.com/uploads/1/3/0/7/130738705/2014776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5fd295a592716.pdfIn PDF document text
    • http://2220202.ru/jajukigihmpyg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fdc45ee78092.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/0431949f4f.pdfIn PDF document text
    • http://housefashion.ru/offshore_engineering1j3yt.pdfIn PDF document text
    • http://front-glass.website/63666229269dm29x.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/EQEnkja/magic_castle_piano_tiles_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/jgggjvH/vilezinow.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/nekomitadawuwabeja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_5fc726478e8a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5fd894a1f2120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6009b9e16445f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 5400 bytes
SHA-256: b32cec4466c4dc377f5127fa47558bb904a3714af6a9043f7716d9e68ca1adf3
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 10500 bytes
SHA-256: 48d6b25d74b6f9a09c1777c475445e8b0ba4c66ce4e5583558bcba33507ec372
font_02_sfnt_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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