Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff930d5f3d5bcba8…

MALICIOUS

PDF

72.4 KB Created: 2021-02-17 03:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0db603f5e8e67830f3068ba7e5cb5d0a SHA-1: 8d20bfbfc2f2261fb3d4a2e25deb5fa00b2ee5b4 SHA-256: ff930d5f3d5bcba80b56182812610e08c242be9996a17ca7dc36ef5b1685e657
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the overall structure indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=north+carolina+state+board+of+education+policy+manual+code+of+ethics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366308/normal_60101fc9c28a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_6022e00e938e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_600f72e748f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_600dbe0d88816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60244ad4f367e.pdfIn PDF document text
    • http://xaxikobovivo.22web.org/dental_antibiotic_prophylaxis_guidelines_2018_penicillin_allergy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijalaxovove.rf.gd/71018211478.pdfIn PDF document text
    • http://pojuzuduxotazup.epizy.com/dovotorumafudanupojijidu.pdfIn PDF document text
    • http://lesizuli.epizy.com/71242034773.pdfIn PDF document text
    • http://ruludamena.epizy.com/xamarin_forms_bitmap_to_byte_array.pdfIn PDF document text
    • http://muresapidun.epizy.com/86227211566.pdfIn PDF document text
    • http://titarejidawe.epizy.com/facebook_video_online_android.pdfIn PDF document text
    • http://wapudajikipidem.epizy.com/67367915146.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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 5608 bytes
SHA-256: 0caa4644a7c3d085d69bc89ee9eb8a2fe18655c6c60082f196f366c1de715ea6
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10032 bytes
SHA-256: 03a396a276ee105fe10061b91e7e27d30eb9649b3b2ed5edf24f2d867a2f6a8b

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