Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad09fc253fe5969b…

MALICIOUS

PDF

65.9 KB Created: 2021-02-24 15:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: baa993f8c0ac58a42864ad7bf7a0f414 SHA-1: 7043c7697daf7a3328b964402403c48a869cb617 SHA-256: ad09fc253fe5969b203562c5ac46e8d68c6204d9af5c61f85df25977aae95759
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to external websites, including one that appears to be a search result for a product manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=sears%20freezer%20model%20253%20manual PDF link annotation
    • http://kamikofonem.mygamesonline.org/guba_and_lincoln_2005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5ff120e7de4c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5ff2d63e8fbb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600d2563a49b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414358/normal_5fc6d73357793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fd33fb8383d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6033b63f968f7.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/tikefom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fd03a8276dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_600e689f7adca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fefef2365932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_601766fa77dd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pozobigeva.rf.gd/15404649489.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/muzevanedus.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/44989420680.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/8386863526.pdfIn PDF document text
    • http://magivaxinel.rf.gd/goods_inward_inspection_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C1 5380 bytes
SHA-256: 56b0b0140ef112dbcba67e9d9cdd93ccb93221a8b0076c82531c1f3c548b33d8
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 10496 bytes
SHA-256: 664686f407eebbac6a27c91c530b7b0c4ded923ebc0463e8f7516f406a8c8e96
font_02_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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