Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5a304beb8c71e2…

MALICIOUS

PDF

76.8 KB Created: 2021-03-12 20:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8a21e5c824a47828ff4df5077858372 SHA-1: 5ba78f0c1e56fa9c9f446a942900a827b6487baf SHA-256: af5a304beb8c71e2f129c5a994c85f2b3acc2f54c32ede9be0fe2f21f52bafce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ML classification and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'linear regression analysis excel template' lure, which is likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=linear+regression+analysis+excel+template PDF link annotation
    • http://expressvpn.store/cracking_coding_interview_githubgqln9.pdfIn PDF document text
    • http://dle-tpl.site/4466222939ms1yq.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/jfNnTjj/cleaner_for_whatsapp_pro_apk_download_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450513/normal_60076eeed9aae.pdfIn PDF document text
    • http://bonifacy.site/liwekofut0wune.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/idIL9n0/zimejanebaxabidow.pdfIn PDF document text
    • http://all-system7.xyz/65861712336zsoo7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_60012b2b51b4f.pdfIn PDF document text
    • http://tehnopolis.org/wings_and_embersm1t63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601af58e85ecb.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/10084782133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fda489a76453.pdfIn PDF document text
    • http://artdebug.site/3831517012877nsy.pdfIn PDF document text
    • https://cdn.sqhk.co/fazofasufiwu/hHbGujf/96121092332.pdfIn PDF document text
    • http://monongzhlh.space/99223569914bfqbr.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/22993954161.pdfIn PDF document text
    • http://ru-order-687646765445.art/56771736775ljvo8.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/dGhfjgo/1637947285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_78ea8973d9ca4ef0b60fc2835e9c0832.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_f76b6fa9fee44f0c8d668791ddffe30c.pdf?index=trueIn PDF document text
    • http://jemukiguwuw.myartsonline.com/15920304452.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_a3faabd13bc4493f9b2f26cde99d18e8.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_36e38aee333c4020a86330f0d3408e41.pdf?index=trueIn 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 5364 bytes
SHA-256: 01f5fcaf09671e1020fae78f580954e123f3defa2470578e8abd2d2bd82d60b5
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 11060 bytes
SHA-256: 24ac3d30cac889523fdc1de438657ddbea4b208edaa623d725b013147d282d2f

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