Malicious PDF — malware analysis report

Static analysis result for SHA-256 269a6b787a04e70c…

MALICIOUS

PDF

80.5 KB Created: 2020-11-29 20:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 481280dade803e636e7db9b27522829a SHA-1: 90a6c180a188b8f162f69856b40beb8908d401c7 SHA-256: 269a6b787a04e70cb994e6e316e5e6902896973c9867e717571f2542b8923baf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://trafffe.ru/123?utm_term=understanding+normal+and+clinical+nutrition+9th+edition PDF link annotation
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/a21786ea4c.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/819ac2f13.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/kofefokigevuruwizuk.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/d4b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5f98cac91932b.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/c04dc84919bdfb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a85775-51cc-46b0-b29c-c513f34c30c9/blade_and_soul_outfit_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a09bdc-0b74-4936-8ed6-06886ca04c34/93269638020.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/discount_tire_black_friday_sale_2019.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_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 5500 bytes
SHA-256: 533bd754868918194c092e24a934098fc9cdde789393cbc64d2bd2e6d62753c6
font_01_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 10928 bytes
SHA-256: 8df5d0a13ef9b906ad41a97b417cf80356525d29b9813def3d3d6edb37e1570d