Malicious PDF — malware analysis report

Static analysis result for SHA-256 6924f7cd27b87f3b…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 09:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e5c456cea7151f4590558561c3228ba7 SHA-1: d819be0330dd9f53e133b6ed09450cf3607deb3e SHA-256: 6924f7cd27b87f3bcd77b868f073fb9211d98a55fd577cd226de1114428b9026
134 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to lesson plans and download prompts, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=small+group+lesson+plan+template+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494433/normal_5fb471368d280.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/dusapajibumirefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5fb768a66a4ad.pdfIn PDF document text
    • https://site-1176426.mozfiles.com/files/1176426/crazy_cat_escape_room_chelmsford.pdfIn PDF document text
    • https://site-1172732.mozfiles.com/files/1172732/golden_star_theaters_country_club_mall.pdfIn PDF document text
    • https://site-1176791.mozfiles.com/files/1176791/mx_player_web_series_list_2020_high.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/giguno_wejerej.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/7996c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5fa07df830448.pdfIn PDF document text
    • https://kuwewukes.weebly.com/uploads/1/3/1/6/131636575/3554bb8bd3b62c.pdfIn PDF document text
    • https://vivenovexo.weebly.com/uploads/1/3/4/6/134695888/6611170.pdfIn PDF document text
    • https://site-1172703.mozfiles.com/files/1172703/bombsquad_mod_apk_unlock_all_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5fc94acb0f671.pdfIn PDF document text
    • https://site-1184137.mozfiles.com/files/1184137/codigo_penal_de_guatemala_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5444 bytes
SHA-256: 157158cffc7fb845fea9a6cb1e1c6555ed8afd25e9cd649c977bbdc4e7977796
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 10904 bytes
SHA-256: f936a287f36f09760a0a9584eaf30fc786bb53867039d992a1a0dc924e7cfc68

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