Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca5397d5b0e0fe9…

MALICIOUS

PDF

63.4 KB Created: 2020-04-25 00:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: be40cf3fc4cbf7ca0a590a20084d96ad SHA-1: 8785acb832385620375dd019e92da95c01a2db5d SHA-256: 0ca5397d5b0e0fe9333cbf34b379371a2ad94a78f0e00d5ce06a0bcc2f1cf4ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document masquerades as a vegan diet food list but contains a large number of embedded external links, indicative of a link farm or SEO spam campaign. The heuristic 'PDF_SEO_LINK_FARM' specifically identified this behavior, flagging the presence of numerous links to other PDF files. The ML classifier also strongly indicated maliciousness, supporting the assessment that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pearlseattle.com/uploads/1/3/0/6/130604050/130604050.html#vegan+diet+food+list+pdf
    • http://elizabruidsmode.nl/uploads/1/3/0/8/130813478/jufawul.pdf
    • http://columbiacountysnowfest.com/uploads/1/3/0/9/130969003/gutuga-kugefepexi-sibati.pdf
    • http://djdazzle.nl/uploads/1/3/0/5/130540304/luraxer_lixijus_jilabupurixaxe.pdf
    • http://dol-dek.com/uploads/1/3/0/2/130270989/1814161.pdf
    • http://wanderinluxe.com/uploads/1/3/1/3/131398193/449c4.pdf
    • http://jamesstegallconductor.com/uploads/1/3/0/7/130738996/c723441a96dd.pdf
    • http://koloryswiata.com/uploads/1/3/0/6/130604088/vokisu.pdf
    • http://neurooptimizedtraining.com/uploads/1/3/0/4/130477090/zetukafeza.pdf
    • http://raycessna.com/uploads/1/3/1/4/131452799/7c69446bdd7fb.pdf
    • http://verticallyltd.com/uploads/1/3/0/3/130323212/zumomumevogajuj_zasatarij_bedodesiti_susoke.pdf
    • http://yarakphotography.com/uploads/1/3/1/4/131437172/28c7b06fc458423.pdf
    • http://toddgriner.com/uploads/1/3/0/7/130740222/kiwifajobil.pdf
    • http://jandonline
    • http://circ.Share
    • http://www.n4h
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5e.bin
17b52aa468ad98d4dc754e5edfc82c45c820adc99b6f84881dbab2642b3695dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 9192 bytes
font_01_sfnt_off0000dd93.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 2652 bytes
font_02_sfnt_off0000e6f8.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 1708 bytes