Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7952038e9f8f292…

MALICIOUS

PDF

68.7 KB Created: 2020-12-22 21:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c8dbc4624485b9677f64ec305f18afc SHA-1: 65eb7261913f7745b7d5df7a9ea73a861bd20dc4 SHA-256: e7952038e9f8f2923c3c21867c7164b32addba72fb14c56f593b4a0c9d798a5d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://traffset.ru/123?utm_term=doe+calendar+16-17-20', is flagged as suspicious. ClamAV detection and ML classification further indicate malicious intent, specifically identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a 'calendar' theme, likely a lure for phishing or malware delivery.

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://traffset.ru/123?utm_term=doe+calendar+16-17-20
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5f99861e4f0fe.pdf
    • https://cdn-cms.f-static.net/uploads/4499021/normal_5faf49d987881.pdf
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/3838268e7c70c9c.pdf
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fd22291ca3d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/37d15de4-9af6-4da0-b8e6-62783a518086/4568920505.pdf
    • https://s3.amazonaws.com/neviwove/kumbakonam_vethala_gana_achu_song_free.pdf
    • https://uploads.strikinglycdn.com/files/ab418fcc-3140-4c8c-8b62-21b65d5dc9ab/xozepamupenaduxememopam.pdf
    • https://uploads.strikinglycdn.com/files/20063e7a-cf4f-4a70-864b-a6b7664a7e07/wodosebobeme.pdf
    • https://uploads.strikinglycdn.com/files/ec176c18-ccca-4067-a17b-1751d458c9e6/siwesadituseduneki.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/chatuchak_market_map_2017.pdf
    • https://uploads.strikinglycdn.com/files/9707a1e9-0451-4e63-8ac1-31eeb48d4ce7/24116104061.pdf
    • https://s3.amazonaws.com/vifusupegiza/newibunenunojewularunito.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_off0000d00e.bin
1a6ac40eaf191fea16286d427ad6b46ce63ed630b8619e1bf85499bec5effbcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 5344 bytes
font_01_sfnt_off0000e257.bin
dd03570ce09223e1eb17f04334371f4a5cc3bbc001a839a7bf511e37b319f333
pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 10480 bytes