Malicious PDF — malware analysis report

Static analysis result for SHA-256 695090e0d033cf14…

MALICIOUS

PDF

66.8 KB Created: 2021-02-21 16:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c894d48e98d51c3e286563cfd7e7d8ce SHA-1: 8541c33b61afb05bffb2e90905b635c496fb1263 SHA-256: 695090e0d033cf14ddbc9d307488818cfd87d3313ff927e60fadd59c669857e8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=bissell+crosswave+pet+pro+parts+diagram PDF link annotation
    • https://fitatopiwize.weebly.com/uploads/1/3/0/7/130739398/7169281.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/AajbAdi/nokinifejo.pdfIn PDF document text
    • http://youla-24.cc/gupapixeketargw2g9.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/hgggPxJ/callaway_golf_clubs_costco_review.pdfIn PDF document text
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/jojukopafiketi_solib_gakelefigadok.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/eEhciDs/find_my_friends_app_for_android_phone.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/kulazudavukegusaj.pdfIn PDF document text
    • https://jegobegopij.weebly.com/uploads/1/3/1/8/131871729/vopubuvuf_takasesova.pdfIn PDF document text
    • https://reravonox.weebly.com/uploads/1/3/1/8/131856904/defodanadigekurinoki.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/e71ea33.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/kosiretuwosip.pdfIn PDF document text
    • https://kunubukom.weebly.com/uploads/1/3/4/5/134599245/3de0f6.pdfIn PDF document text
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/koregawifik-julixuxeno-kegufofor-tikixisobobep.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/671a74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebomedug/free_printable_color_wheel_template.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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 5592 bytes
SHA-256: 82e27a44b8db682c6fb376c66e7dd2186398928729a7ea95bc1639fa8982317a
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 9604 bytes
SHA-256: b4aa38adb190e57b90589eca116506c2b77a6e1f0c6dbba30907e4cdcc70b014

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