Malicious PDF — malware analysis report

Static analysis result for SHA-256 68231cbb5bec6933…

MALICIOUS

PDF

37.1 KB Created: 2020-04-14 09:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8425dc52728b6df4d8622b85465b1d1 SHA-1: 5c538463ea673f98d946358ac87e07fd86b6bc88 SHA-256: 68231cbb5bec69333a3d5f164482a21e8a7ab8548f9a06971c3e97bd959d7e13
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO-friendly PDF slugs, indicating a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'Calendar app android widget' and references external URLs, suggesting a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://armstrongenvironmental.org/uploads/1/3/0/8/130813714/130813714.html#calendar+app+android+widget
    • http://randallwalkerlmft.com/uploads/1/3/1/3/131379247/5384934.pdf
    • http://thunderfitnessct.com/uploads/1/3/0/4/130488152/9755483.pdf
    • http://mawmaintenance.com/uploads/1/3/0/6/130605017/nigulalazadoj_deledunazi.pdf
    • http://lucyvolove.com/uploads/1/3/1/4/131407846/4220307.pdf
    • http://motherearthflower.com/uploads/1/3/0/4/130483322/kebededopaz_nudibafigekurij_fipewasezev_fuxufaludujoja.pdf
    • http://thomsonplaceboston.com/uploads/1/3/1/4/131483217/3471678.pdf
    • http://hostmaster.livephierce.com/uploads/1/3/1/3/131379225/nojalawapatulap.pdf
    • http://windsorbaptistchurchil.org/uploads/1/3/0/6/130605143/3433603.pdf
    • http://art-in-venice.com/uploads/1/3/0/2/130271031/xofozexegafov.pdf
    • http://kantkollections.com/uploads/1/3/0/2/130270811/wirurosiw_dojuvatuwid_niduwune_zotef.pdf
    • http://mrsadamsrm139.com/uploads/1/3/0/6/130620950/niwepa.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006927.bin
f639bb0b349a3de9fc6b827b6a87564f1023644c8eb5df2d8a1655bb74fcf84a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6927 7512 bytes

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