Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaaaa343164ab5a…

MALICIOUS

PDF

82.1 KB Created: 2020-04-25 10:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca0c725c99122711c01bc4767a3ec5aa SHA-1: 0a6aa784e3f8d0c1af42d6f56433ddf3f9d73207 SHA-256: dbaaaa343164ab5a4b526545d25744c9e1edab22a5b4ddc4e5cedbd5c24ff301
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to similarly structured URLs on various domains, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text suggesting it is a 'Farewell to arms study guide', which is likely a lure to direct users to these malicious sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://katinadavisministries.org/uploads/1/3/1/3/131379830/131379830.html#farewell+to+arms+study+guide
    • http://thehumancult.com/uploads/1/3/0/6/130621666/tadegaxogisexipajad.pdf
    • http://ryugroup.com/uploads/1/3/0/5/130551639/765294.pdf
    • http://vladtheinventor.org/uploads/1/3/0/3/130313577/89c39711eeee9a7.pdf
    • http://pauldevlin.com/uploads/1/3/1/3/131398142/4828657.pdf
    • http://krcabinets.com/uploads/1/3/0/3/130379804/38042.pdf
    • http://seattlesoccershop.com/uploads/1/3/0/8/130814003/ae3cc9f8f6a5.pdf
    • http://ironwillhiking.com/uploads/1/3/0/6/130620483/buzunadimu.pdf
    • http://melaniellc.com/uploads/1/3/0/9/130969946/zunotu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001129a.bin
b4685e31828ea584323575f6d5b2f7f9181a0ed5a966894986f1eb5a046ea381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 7856 bytes
font_01_sfnt_off000130f5.bin
0ef5135eeb280ba5c976b2a332d613d12e028dd4b4b3ad0fba826d662db2b7f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 2628 bytes

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