Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b865a8e78c66cf8…

MALICIOUS

PDF

72.7 KB Created: 2021-02-23 20:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26ba4ca4dd3b2d4e07481a675ba85267 SHA-1: dfd9b0ee11d16853dd49604f2362a559b739b489 SHA-256: 3b865a8e78c66cf8eb42a5b10b7a448d7718a6afa7877a4287fe37fd806ec2ea
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting and uses an invoice lure. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure itself contains malicious links.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/123?utm_term=nikon+d4000+price+in+pakistan PDF link annotation
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/a11cb50f.pdfIn PDF document text
    • http://ses-paypal.com/migudotewewuxubujfpbza.pdfIn PDF document text
    • http://fortuneo.biz/70095380476lgsc1.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/1005345.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/NW73hcx/amc_stock_forecast_zacks.pdfIn PDF document text
    • http://nibatuw.iblogger.org/free_printable_auto_repair_invoice.pdfIn PDF document text
    • http://sreview.online/xajuxnwjk7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_6004b63adc3d8.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/91072787680.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/ghjiije/tetugokudonex.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/3b001b572f265.pdfIn PDF document text
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/84b7186889.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/madutadafavozel.pdfIn PDF document text
    • http://nipodek.22web.org/13231862207.pdfIn PDF document text
    • http://labiosdewonda.com/14145532029iuoob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxanudof.epizy.com/canadian_solar_400w_datasheet.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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 5296 bytes
SHA-256: 83df40d55613bab8a9f4d1a940c166c44fdf4f1ee0205947d8aaf2187f06c44a
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 11092 bytes
SHA-256: 8474d77e877c206bcf1a7389e6923265ce3d9459a8c2a328d9ae04594a9f982a

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