Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4a9a8e819474cf…

MALICIOUS

PDF

81.3 KB Created: 2020-11-17 21:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a4f2b8d13e2efe29fce554cd9aa8e22 SHA-1: 59c3e4633a7084e68adf0c67f28d391878ce27e5 SHA-256: 8e4a9a8e819474cf0bd171226c1995093db5863bfd9c7d85bdc5f7b9bced7205
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, with one prominent malicious URL pointing to 'traffking.ru'. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=tu+zonas+erroneas+libro
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/5262126.pdf
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/gezurevuvogixamomo.pdf
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/9321252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e7522cea-d1a7-4c59-a538-1cad4e3e29e8/losakimari.pdf
    • https://s3.amazonaws.com/netinuwa/54257864239.pdf
    • https://s3.amazonaws.com/wexukufedepim/heroclix_rarity_guide.pdf
    • https://uploads.strikinglycdn.com/files/e0ab81e6-8205-4f4f-b3e5-2fb423a7fc97/1821514172.pdf
    • https://uploads.strikinglycdn.com/files/35d8a8d0-079d-4292-b3f8-f33484c2a501/luvavatijigapu.pdf
    • https://s3.amazonaws.com/fifomi/50630826540.pdf
    • https://uploads.strikinglycdn.com/files/26311f92-7ea4-4014-b6df-509841bcd34d/25821525698.pdf
    • https://uploads.strikinglycdn.com/files/0c6eea94-e32f-4972-95ec-f33bb7d866a6/mega_man_11_all_bosses_no_damage_no_items.pdf
    • https://s3.amazonaws.com/dudurat/samsung_manual_refrigerator.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e284.bin
1db6f90ac61c76220c9132d237c56a0ba2a6b2cf12c47bc499b0f1d80da14c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 4820 bytes
font_01_sfnt_off0000f2ed.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 1800 bytes
font_02_sfnt_off0000fb7b.bin
43b2ddae8de5c4474692c85ecb9f228f201a1f9496275b6b7cf7f1cc9f7f20e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 11476 bytes
font_03_sfnt_off000120a8.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 16312 bytes

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