Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a528c8799fe341…

MALICIOUS

PDF

71.6 KB Created: 2021-02-25 18:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 911fde7d1a71ebdb8bc8edfd6b3aab1e SHA-1: 23d02ff6d9a525cb3105be01225c8f3f66e32f02 SHA-256: a7a528c8799fe34156d0b97be56d0cdd8d2bb64adbbfa379710fb72b1ba7aa9a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely using JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=american+red+cross+first+aid+practice+test+questions PDF link annotation
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/vigamisonale.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/robot_coupe_r2_dice_blades.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_5febd2d5a0769.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/2602735936.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/634ed84230cd36f.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/96794859186.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/should_we_all_be_vegan_book.pdfIn PDF document text
    • http://siteninovubaba.22web.org/wudirotilo.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/3_letter_airport_codes_nz.pdfIn PDF document text
    • https://fikomepa.weebly.com/uploads/1/3/5/2/135299400/jexure-xikenare.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/82853963041.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/7601837.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/what_is_financial_planning_model.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe4a1095e75a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ffe2899a11bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_602b6193e5610.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/913080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiluxusimutine.atwebpages.com/presto_23_quart_pressure_canner_sealing_ring.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/70262934090.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/which_is_the_best_denture_adhesive_uk.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 5384 bytes
SHA-256: 63b5037e86a3269de87e0a6fa8018d10a4a09a3bd68e3d08f8855f9bf1b405c4
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10572 bytes
SHA-256: ea95440a2d1298a8c818732580dcabca3fb0f153305359fd2ca8c765fad55cd1

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