Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c64544a89ed52bc…

MALICIOUS

PDF

77.1 KB Created: 2020-11-20 23:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91ca766394112b13cb397b9977045679 SHA-1: b9448cb075d82e13d8a584e5ed65bce8bf7333b6 SHA-256: 4c64544a89ed52bc68e1549bebcb095f4fad56ced405d96f18c97a8fc1fadcd9
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 significant number of embedded external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffe.ru/123?utm_term=manual+grain+grinder', and another suspicious URL is 'https://sujuwezel.weebly.com/uploads/1/3/4/4/134486010/55d4dc2d.pdf'. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=manual+grain+grinder PDF link annotation
    • https://sujuwezel.weebly.com/uploads/1/3/4/4/134486010/55d4dc2d.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/5149781.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://deketonozalupu.weebly.com/uploads/1/3/3/9/133997688/9ffe9d6a22903a8.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/gezejoputiwinu/definicion_de_talleres_automotriz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66313c6-50de-4bd4-a5c6-210f28a6f669/liderazgo_con_proposito_rick_warren_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb99c2b-f47d-424b-8ece-f24f5b7ed234/7570453481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58d8acd-9a5c-48f3-b6f1-7a7dd790df4c/86113184823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10da4508-d166-48a7-8ff1-cd70be67b18a/57642690098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390ed6be-5edc-4aa5-85d6-7d7a757fdded/dumexegelufikazo.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/vetenuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df3e0fc-73e9-4445-a36d-6ffa483e7538/57976223494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df3990f-534c-4d95-aa8b-5593751d50bf/french_wine_for_a_flat_belly.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/what_colors_make_green_grass.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/afx_slot_car_price_guide.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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 4512 bytes
SHA-256: a7e0dd47f8f0265feb79cdcd7701d0d2222ee5d589eadd40c0d0f19f0866e7e3
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10900 bytes
SHA-256: 66ec6f43153b82eac6099116cf44370b69bdd6e3ebcc35cbe3c326398ee1eaf2
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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