Malicious PDF — malware analysis report

Static analysis result for SHA-256 4690589093b41b46…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 03:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 089752a0fc2f0815c7ee8d0cd916551e SHA-1: 99c19aa079569379b8a4faa1e68101d7486f9314 SHA-256: 4690589093b41b46b9484ecb4c68b48281760dc1912ef4ee6868bdad800b9f96
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://baarspo.ru/wix?keyword=logitech+harmony+350+universal+remote+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd64782c66e1.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/b6haHgh/98104248054.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/fufexizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_5fdea5dff198b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fcebb98f1f0a.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/546a96.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/a7zchb6/redatizum.pdfIn PDF document text
    • http://net-klientov.ru/corrugated_sheet_metal_thermal_conductivity1dau3.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/is_death_note_netflix_movie_good.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/gOrhe3Z/faith_family_practice_west_liberty_kentucky.pdfIn PDF document text
    • http://agent-spv.space/why_renaissance_started_in_italyjl73g.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/hdujhbN/best_funny_viral_videos_of_all_time.pdfIn PDF document text
    • https://sezalufuveded.weebly.com/uploads/1/3/4/3/134389043/647977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigosip.epizy.com/bahubali_1_movie_tamil_songs_free.pdfIn PDF document text
    • http://kovuzamizin.rf.gd/2012_hyundai_sonata_hybrid_transmission_fluid_capacity.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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 5744 bytes
SHA-256: 8d401f139a3d21f4a462ddc9216a4f688fee31337162c48ba133eedd88e1e78e
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10428 bytes
SHA-256: 7d5b7cfe676039e3def3b3ea5a86f059ea2fba7c2aeb1af9fbf2df182dfa8b44

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