Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b633b6dbe3f393b…

MALICIOUS

PDF

67.6 KB Created: 2020-11-13 09:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d19a3556193d29453d9cbcb39d2c8afe SHA-1: 19f1ec4baeab34635a779f8ac4373da7a8e8623a SHA-256: 8b633b6dbe3f393b802c9d0aa44c490b84bd8e2b28d3b457c91b79ffe7640963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to 'traffking.ru', suggesting a link farm or phishing lure. The presence of numerous external PDF links also indicates a potential SEO poisoning or link farm strategy. While no scripts were extracted, the overall structure and heuristic firings strongly suggest this PDF is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=i+do+we+do+you+do+lesson+plan+examples
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/bimaxofafulewefidomi.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/6589686.pdf
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/261883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kofabube/minilogue_xd_librarian_manual.pdf
    • https://uploads.strikinglycdn.com/files/de398d3d-9340-410e-8463-5b82ce86f9ef/61528956133.pdf
    • https://uploads.strikinglycdn.com/files/5d685e17-6748-4d5c-bbf7-3279237f50ae/fitzpatrick_dermatologia_en_medicina.pdf
    • https://uploads.strikinglycdn.com/files/ecdc4291-58c1-40d1-8811-453e764cb337/95693582884.pdf
    • https://uploads.strikinglycdn.com/files/0b1954be-0442-45a3-b0f9-eb66ae9b5e86/4765189249.pdf
    • https://uploads.strikinglycdn.com/files/3f984f7b-7492-4421-a99c-ffa631b8d54e/bidafapago.pdf
    • https://s3.amazonaws.com/zebarufuridorur/ridgefield_battle_of_the_bands.pdf
    • https://s3.amazonaws.com/jozetej/ravobuxujomuwunavik.pdf
    • https://uploads.strikinglycdn.com/files/18ddc59c-e71a-4942-b93c-a6e3b0627558/16748586545.pdf
    • https://uploads.strikinglycdn.com/files/8d97ee1a-7e86-46e8-a146-a2c70db995a5/mountain_view_kennels.pdf
    • https://uploads.strikinglycdn.com/files/9254a213-f332-4ffa-9c1a-8ed61975437b/zefeboxetuvidel.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_off0000cab3.bin
62495d536a25036222c3c911b90fb3f94480f1368b3abc12320647bf9386e0a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 5208 bytes
font_01_sfnt_off0000dc75.bin
f2fce7d34da4fb367ae8834ab5f354f5f207b24734222b446f2d8a3db77bc771		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 10556 bytes

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