Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9051911c389b21f…

MALICIOUS

PDF

72.5 KB Created: 2021-01-31 20:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ba081bd76850b89af27170cf4a7ccff8 SHA-1: fd4fde6e15a790f971150be1f0a96ed14aa0b14c SHA-256: f9051911c389b21fdb983a17756bfb043b37b3a11c50a910d943eb322288dc87
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, indicating a link farm designed to distribute content or lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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 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.
  • 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://maypoin.ru/123?utm_term=makita+guide+rails PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495846/normal_6010fab1bbdf7.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/568bce64.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/ehbjiih/maximum_nasal_cannula_flow_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/fljhzKg/zinoxitasoxukoxarawowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fd9e301e89cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fc607c6edb16.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/0ggjh7c/ritusu.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/hG1Oehc/escape_hunt_the_lost_temples_room_3.pdfIn PDF document text
    • https://buxutagugumazas.weebly.com/uploads/1/3/4/0/134095839/3104632.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/7662406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_600d1251230a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fec4bdb84290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momugegunimex.rf.gd/beyblade_game_for_gba_emulator.pdfIn PDF document text
    • http://sewoxoxitif.rf.gd/81618069937.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 5060 bytes
SHA-256: b30dfb169c733dda024ece84b5e10659c4733999dc195bc64ed918852245307e
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 10680 bytes
SHA-256: e9239e698ece582469a2132028fa86f2c94216f92f48162d51f7db6ccbb59412

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