Malicious PDF — malware analysis report

Static analysis result for SHA-256 4700644206f20934…

MALICIOUS

PDF

62.4 KB Created: 2020-11-13 07:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7619dbc5fecc7f8742b7593172d0b157 SHA-1: eb352f8597722d29b104f94a93bae0dc121f3e99 SHA-256: 4700644206f209342736a3c81ade5b2bb230ac1f84fd9e2ab37f0b7d047d4cf1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document functions as a link farm, with numerous embedded URLs pointing to various external sites, likely for SEO manipulation or to serve malicious content. The presence of a redirector URL suggests an attempt to obscure the final destination, which could be a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=cycling+jersey+template+vector In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5f9553aa8c820.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/2899663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8cc1e3641f6.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/0e45a5.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/5292646.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/juxezuvorezekak.pdfIn PDF document text
    • https://taneromujek.weebly.com/uploads/1/3/4/6/134611199/magovab_jaxez.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/modiwisagepuw.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/neviwove/abcd_malayalam_movie_online_watch.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_off0000b86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86E 5396 bytes
SHA-256: ed799b5b0e5e76e06c0c89c5ce8f2488b46b52a236f69897190e53a049f5e5db
font_01_sfnt_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 10100 bytes
SHA-256: cd2245834d59cfaa73e9a21a4c392a9cbc182c71a1326495ea4b2ff3f19450e4

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