Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4a1f906ca1b536…

MALICIOUS

PDF

68.4 KB Created: 2021-01-03 16:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 990ace5a9cc3e2febe4791a2552fcbd8 SHA-1: 6d9a20fe12768bf101647398124bdf5189062443 SHA-256: 0d4a1f906ca1b536cce60b9a043fb7a77cde6cf6a80bb7cd22e21256da7c3bf9
156 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 significant number of external links, identified as a link farm, with a primary malicious URL pointing to 'trafffi.ru'. This suggests the document's purpose is to redirect users to potentially harmful content or facilitate further infection. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=lurgio+middle+school PDF link annotation
    • https://cdn.sqhk.co/terexugureto/Wiizjbt/moldes_reposteria_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/d40ehaP/cara_multiplayer_city_racing_3d_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_5fb8270514e27.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/jcrjfmO/face_passcode_lock_screen.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/figejobemeruboradosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f95f3b248bea.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/jaqiaFT/78111055588.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/tomaxade/implosion_full_version_apk_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b243a6a9-6972-42e1-bc7c-45c2a7c5f0c7/verbos_para_objetivos_generale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d110b8-9494-4ed6-a0be-0adc641d6be7/2002_hyundai_santa_fe_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f38a49-4986-4876-9c5b-969acd7a33c2/difukeki.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/fuviroroboveputotadamiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1368cee8-ca8f-4055-b46e-19e25679f397/40309147600.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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 5084 bytes
SHA-256: 52c5c9a45af5488cbbc753aaaaf511b4b2dbe04f912e79ad10a0a9d976fa05d8
font_01_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 10168 bytes
SHA-256: 22da76bec1c6759b3f7cb5f327de262d21c73265d1a8ba691d20fd7e854bed9e

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