Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd70b87540bd3bf…

MALICIOUS

PDF

72.8 KB Created: 2020-11-13 22:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 834358194b902e5f17e5e20361881edd SHA-1: 0150f73c2170149aec516507eb5426b0a84c2f3a SHA-256: 8dd70b87540bd3bf3d04de5fb8352e5e2210425be0b4ca1b474147d9d9f91e88
156 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, many pointing to PDF files, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially 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 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.
  • 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/strik?utm_term=pathfinder+pawns+bestiary+4+box PDF link annotation
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/tikavilate-deruwebuxoreje-rojivafuza-fipazifunejip.pdfIn PDF document text
    • https://fiwadevu.weebly.com/uploads/1/3/4/5/134592392/8015514.pdfIn PDF document text
    • https://wijimoki.weebly.com/uploads/1/3/4/4/134485243/ledujuw-vilevubovilax-niwojulu.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/fuvogogusagugo_waritep_pomaxusuvav_fepuve.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tetazino/86236268149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc2dc58-02c3-48fd-b4c1-56a95c2af1b6/93735300146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdfc9a0-9e35-4545-a150-09c330a13873/48315995486.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/packed_bed_adsorption_column_design.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/public_finance_in_theory_and_practice_ulbrich.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/woxuzesewit.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/eastern_dakota_conference_tennis.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/star_wars_rodian_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18c3a6b-cc21-4c23-8152-c72526f4d4db/gawebibobon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b145bdd7-d502-4bc4-9e75-acbc25536622/77525122030.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 5376 bytes
SHA-256: 3efb5a97074ed04a8024de9415cca5cd1453e7b6c2f754e9f099ee000ff36d3f
font_01_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 11228 bytes
SHA-256: a3c151c9ab5dad421badce43ba5a1f7d4a422f3c37d013f92e0db4fddb8248a2
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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