Malicious PDF — malware analysis report

Static analysis result for SHA-256 20918a079d5be6ca…

MALICIOUS

PDF

40.8 KB Created: 2020-04-19 10:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17fd4ad29cce33fd3ae28b44c732e394 SHA-1: 5a4969b6192f37a903cbc6165f30b3f8118b4459 SHA-256: 20918a079d5be6ca32341d27061a3023754de2866c4c43a94b75f94b66437d6b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a "Botim app for ios" lure in its document body, directing users to external URLs. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are hosted on similar domains with numeric slugs, suggesting a link farm or redirection scheme. The ML_NYX_PDF_MALICIOUS model strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 4

  • 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.
  • 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 http://bloodblisterapparel.com/uploads/1/3/1/3/131381112/131381112.html#botim+app++for+ios
    • http://lamiskhoury.com/uploads/1/3/0/4/130483491/zuveligezakexa-totukosipe.pdf
    • http://muskegonapostolic.net/uploads/1/3/0/7/130776316/0b698.pdf
    • http://continentalpublishing.org/uploads/1/3/0/7/130776786/54b3ef.pdf
    • http://lulutechgirls.com/uploads/1/3/0/3/130379466/balibinoxuwaf.pdf
    • http://bruce-lee-roy.com/uploads/1/3/0/9/130969237/pasavale.pdf
    • http://kansascoringandcutting.com/uploads/1/3/0/7/130739223/3130397.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006083.bin
09a0440c566661ae8946db2443b920b699ba3b961c12e7c62d1d6f87820388e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6083 8456 bytes
font_01_sfnt_off00008137.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8137 2652 bytes
font_02_sfnt_off00008a9b.bin
7ad9c7fda690cd7b427f1a1b7eaa01a86d9a5bb72572e812b823840b1c280df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9B 2332 bytes

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