Malicious PDF — malware analysis report

Static analysis result for SHA-256 09be126709914a02…

MALICIOUS

PDF

94.0 KB Created: 2021-02-18 03:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6340572299293904e7ac2ea94ee4898a SHA-1: ec13a3e9f1466219482a0081621b861990c97c04 SHA-256: 09be126709914a02fc6ba577806dc62968708f9732c5d2ddbd9320e334c48faa
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains, under the guise of 'cards against humanity uk examples'. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content or phishing sites, likely as part of a broader campaign.

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://seumenha.ru/strik?utm_term=cards+against+humanity+uk+examples PDF link annotation
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/199204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fcf07a080a95.pdfIn PDF document text
    • https://wijideziwu.weebly.com/uploads/1/3/2/3/132303229/8458498.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/DuThcgc/dewozuf.pdfIn PDF document text
    • https://duzezefoge.weebly.com/uploads/1/3/1/4/131437668/juxakenulamug.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/gawukopek.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/gilizesukenegu.pdfIn PDF document text
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/dopisatapoxexadidiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/jjeiahc/29646980525.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/zeverejusowesan.pdfIn PDF document text
    • https://xijegasafofid.weebly.com/uploads/1/3/0/8/130815381/relubireto-miwijawemez-muvenufudu.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/af806d037611.pdfIn PDF document text
    • https://namosozevo.weebly.com/uploads/1/3/0/9/130969937/c605d7490274.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_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 5512 bytes
SHA-256: 6243c3c444d5dfeebaa136da69dcd049f6bdef3ea4bdde89bb0cdecaee0e96ca
font_01_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 12604 bytes
SHA-256: a59d88456213803450189c161257dce88fbbfc4053b6a31f9879a71fad2d988b
font_02_sfnt_off000155f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F0 16072 bytes
SHA-256: 9f5c39b122af328b89576799afa35494b2b074404cd229a8255c6cd1781c5d44

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