Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdf948f6ca07b55…

MALICIOUS

PDF

74.6 KB Created: 2021-02-24 13:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fef63c2d9745990bfb9a9d2a4bf5794a SHA-1: d6fd43587dca3bccd05e1fdc1ca2f42e3bca2ed9 SHA-256: bcdf948f6ca07b558d3ac7518303d59f51d18dec15432825f1741f390f44aec1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of these deceptive links and the overall detection profile strongly suggest a malicious intent to redirect users to harmful sites.

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
  • 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/strik?utm_term=what+are+spin+quantum+numbers PDF link annotation
    • https://cdn.sqhk.co/posiraki/a7heAia/wimitibudi.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/hj9hgjc/29486609886.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/ia5ji8d/11920278508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474998/normal_5ff76938930cb.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/beelzebub_sub_indo_batch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_6015c6eb7415d.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/cT6gh39/cut_rope_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/jgifyje/elemental_war_of_magic_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/Dk1Rggb/simulacra_pipe_dreams_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5fc733c89a9b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renaxederopuva.rf.gd/banodumozibiza.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/35414274810.pdfIn PDF document text
    • http://dovagoxaluzof.rf.gd/word_meaning_lethargic.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/avakin_3d_avatar_creator.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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 5308 bytes
SHA-256: 962147704a7f749c3c76d6b535e9b38b0e578d191b1f354f4da6a329389aa364
font_01_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 11116 bytes
SHA-256: 4f7561e3d7fe6f7dab6c167c7c02f617da7045d73e253d9fbf5d72d4a53207f2

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