Malicious PDF — malware analysis report

Static analysis result for SHA-256 141023accd390860…

MALICIOUS

PDF

81.7 KB Created: 2021-01-14 05:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d14234ef2eff0b41fff2c082531aafd8 SHA-1: ddc5e7e7b7cacff6b7c683dccc4a7666c642c70d SHA-256: 141023accd390860449301db71ed8fb1285afd07a97e2d5beabdb9531bfc86d3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing lure or a gateway to malicious content. The presence of numerous links, including one pointing to known malicious redirector infrastructure (https://cctraff.ru/aws?utm_term=af+service+dress+uniform), strongly suggests an attempt to redirect users to harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links align with common phishing and malicious redirection techniques.

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
  • 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://cctraff.ru/aws?utm_term=af+service+dress+uniform In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_5fdaaf3acd826.pdfIn PDF document text
    • https://site-1172512.mozfiles.com/files/1172512/stickman_and_gun_2.pdfIn PDF document text
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/wonovajonuzuzir-nivenonozir.pdfIn PDF document text
    • https://site-1173505.mozfiles.com/files/1173505/nirujanogoponugedivuro.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/xuturogenixobu.pdfIn PDF document text
    • https://site-1206985.mozfiles.com/files/1206985/gun_club_2_mod_apk_obb.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/4975983.pdfIn PDF document text
    • https://site-1175626.mozfiles.com/files/1175626/77480489345.pdfIn PDF document text
    • https://site-1207228.mozfiles.com/files/1207228/41564224539.pdfIn PDF document text
    • https://site-1221908.mozfiles.com/files/1221908/hocus_pocus_witches_brew.pdfIn PDF document text
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/6819593.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/sinamozagemoger/happy_new_year_song_naa_songs.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_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 4972 bytes
SHA-256: 377cc4bea3b037e67079905cd1f552242931c0cff14543a4f4c4e48656c22189
font_01_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10424 bytes
SHA-256: 4d5088409ca1094b0338ff0e172b8080e15cde8fddedb8e974d15bc289a5c655

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