Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39cd9f76d750f4e…

MALICIOUS

PDF

72.8 KB Created: 2020-12-14 02:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c4e9cef352cfc9ec415f8b57565943 SHA-1: d1b2a74b82657b29633737352562c21b3b0076be SHA-256: c39cd9f76d750f4e6c87959a9b60c206ad886a79972b835db73e73dcc7dfc3f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'trafffi.ru'. This suggests an attempt to create a link farm to direct users to potentially malicious content or phishing sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=vimeo+video+editor+free
    • https://bemisudo.weebly.com/uploads/1/3/4/7/134754710/tibutavutuxagav.pdf
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/8214023.pdf
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/kuzuve.pdf
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/53f2ed7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1b337d1c-a7cd-4a01-89ac-74a5d77f53a3/jinekusisatijomalamo.pdf
    • https://uploads.strikinglycdn.com/files/f675d8ff-3eff-47da-ac0d-48af9ce75f69/bully_pc_download_highly_compressed.pdf
    • https://uploads.strikinglycdn.com/files/3c97dc98-2141-40cb-b557-115ae8351892/komirobizefeliviviroxevo.pdf
    • https://uploads.strikinglycdn.com/files/edc46613-ba04-426e-bf76-6fa3220f7f22/18534390049.pdf
    • https://static1.squarespace.com/static/5fc10304b8467722f1d4df02/t/5fd155139d79d86a998ebb0c/1607554324749/xanosu.pdf
    • https://uploads.strikinglycdn.com/files/a27d9a7d-8105-4477-97e7-b83ce2158817/87942772004.pdf
    • https://uploads.strikinglycdn.com/files/11a05da8-825f-4183-9ec8-a27da9d5ed5e/41430057525.pdf
    • https://uploads.strikinglycdn.com/files/7d563f71-b328-453e-9566-b580b953b433/fragmentos_de_obras_de_teatro_famosas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cf.bin
045dd67b8cd59a5756292635af671277848cad5d7331a319c5f5d2813372b10d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 4656 bytes
font_01_sfnt_off0000f29d.bin
d17c5712e3b160a278eb8e0ba8379e727995e14e23b82263a0ecb0b122352c79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 10572 bytes