Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfca877460ddf23…

MALICIOUS

PDF

75.5 KB Created: 2021-01-16 05:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ed2b4d80609b56f3f85e07fc534d7a65 SHA-1: bd54fa7b88846e9cf07a17703b22efcda86c137c SHA-256: dcfca877460ddf23333c57cceeb4494ad783ae81ef665d94d26e350b0d0cc25f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://gettraff.ru/123?utm_term=canon+eos+rebel+x+s+film+camera+manual In PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/47432ef.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/pifapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464065/normal_5fe4f8971e5ee.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/IZjbje2/citytopia_mod_apk_2._8._5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5fad8ade9d795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fe2320331859.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/semirowulaxijed.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/gfiihg3/contact_angle_meter_tool.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/64904631077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5ff587913caaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5fd73934cf693.pdfIn PDF document text
    • https://site-1171534.mozfiles.com/files/1171534/can_t_select_software_update_samsung_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5fa22593e9d2f.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/firudegix/27452554550.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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 5140 bytes
SHA-256: 98da8c36b10dc7fcd5ffa958e52e0086fd555f77a024cdc91911a4c374e70865
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10956 bytes
SHA-256: 1d488d9127518f8a6b57689e54dbae99721680851e743039d791c758a766f1a3

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