Malicious PDF — malware analysis report

Static analysis result for SHA-256 2183d4098436f974…

MALICIOUS

PDF

78.7 KB Created: 2020-12-30 19:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 466dc7f5b5309d1a8990d845375fa487 SHA-1: f11b4088423e2f39e30873c393a355536c47b1c2 SHA-256: 2183d4098436f9742c6e6bbee804fb2dc3f04053d8cb03bacd665833a25bb7c6
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic and a critical ClamAV detection for 'Pdf.Phishing.Trojan' further indicate malicious intent. The primary malicious URL identified is trafffe.ru, which is likely used to distribute further payloads or redirect users to phishing sites.

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.
  • 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://trafffe.ru/123?utm_term=call+of+cthulhu+doors+to+darkness+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wajidafix/VRo69qv/fudarawuze.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/lhdihOW/check_for_virus_on_iphone_10.pdfIn PDF document text
    • https://gagijilit.weebly.com/uploads/1/3/4/8/134865103/6d55db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383573/normal_5fe4b7b55a5b8.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/bisegilupuf/bhakti_yoga_sagar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8e8f9e-20dc-4e16-b55b-ecf346389cca/zolig.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/hey_there_delilah_piano_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/raluwabuxuxuk.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/kinebuxufulegi.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/artigos_academicos_sobre_meio_ambiente.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/red_hp_laptop_17_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/gazovenila.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/netaredimoresuwunov.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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 5304 bytes
SHA-256: 7098c82da45a59388abc336dfa02d3b4c3ddd3cb3abc13c26fa91c860c72251c
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 11672 bytes
SHA-256: 2e4719ea46861338af6d2eb10094d895ff7111dac03156a65fc0f1e7c8bb7ce2

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