Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83df2b7ec409fa3…

MALICIOUS

PDF

52.9 KB Created: 2020-04-11 02:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e78faf9562cefbd7c5cf8082f53816b6 SHA-1: 48a7e50821dc4e53046db205494e7bd0698431ab SHA-256: f83df2b7ec409fa34b8cf41133e6cdbe6056484dc845ccb96c64b6525144b858
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to domains structured similarly to SEO link farms. The document body is heavily obfuscated and contains a URL that appears to be part of this link farm. This suggests the primary purpose is to distribute malicious links or engage in SEO spam.

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://7levelselling.stefanaarnio.com/uploads/1/3/1/6/131607163/131607163.html#objetos+tecnicos+compuestos
    • http://sirrendervideoediting.net/uploads/1/3/1/3/131383760/0671f9ec8e8.pdf
    • http://lilart.fr/uploads/1/3/0/5/130588735/taxopi_zamorizimirupil_wosixorobuposu.pdf
    • http://matherleap.com/uploads/1/3/0/4/130488273/c99704b8f7f.pdf
    • http://www.thepinkmews.com/uploads/1/3/0/5/130543074/rewojisavekununab.pdf
    • http://santicleaningservices.com/uploads/1/3/0/6/130621401/a0c34a.pdf
    • http://sernasinsuranceagency.com/uploads/1/3/0/7/130740561/252cb2c5dd3.pdf
    • http://reliezpartners.com/uploads/1/3/0/2/130289294/jejigovoro.pdf
    • http://empowerinparadise.com/uploads/1/3/1/4/131406361/rivawin_sifekodurugun_sevazo_lunokivuw.pdf
    • http://nancebmecleaning.com/uploads/1/3/0/3/130323124/4262092.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_off000099dd.bin
15aedcb1de73eb57ed0660b6d53eb4104d704dd871f8a81146663e1d66d8b419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DD 8624 bytes
font_01_sfnt_off0000b901.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB901 4144 bytes

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