Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2f3a6b4ecb3a8d…

MALICIOUS

PDF

40.0 KB Created: 2020-05-13 03:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c809563fc8430b0817421953d0cababe SHA-1: 795b79c95d61dd5a54a14bf8e849608d94580fc9 SHA-256: 9b2f3a6b4ecb3a8de1907e25adb41f092e8454bb5303c11682c909d8753296a2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various websites, many of which appear to be SEO-optimized PDF lures. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains references to 'Petg filament spec sheet' and 'wkhtmltopdf', suggesting a pretext for directing users to malicious external content.

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://prefacioclothing.com/uploads/1/3/1/4/131410736/131410736.html#petg+filament+spec+sheet
    • http://tanheeming.com/uploads/1/3/0/6/130639504/9327723.pdf
    • http://jakemcclay.com/uploads/1/3/0/6/130621525/jenekemivisawosoxulo.pdf
    • http://trenchessports.com/uploads/1/3/0/7/130775334/rusiw.pdf
    • http://lilliemaechocolates.com/uploads/1/3/0/7/130775626/380402.pdf
    • http://storybookgoat.com/uploads/1/3/0/7/130775106/sadoxemefopuxirosi.pdf
    • http://stitchedmfr.com/uploads/1/3/0/5/130550663/nexawopo.pdf
    • http://capperlab.com/uploads/1/3/1/4/131406714/c6d79eb3.pdf
    • http://mylingerieplay.com/uploads/1/3/0/5/130589054/werotizo.pdf
    • http://edgecleaning.ca/uploads/1/3/1/6/131606509/segimalunomevupuxa.pdf
    • http://aperfectsurfacenc.com/uploads/1/3/0/4/130488114/gubolumodegur.pdf
    • http://gwcbristowwhps.org/uploads/1/3/0/7/130775676/1010636.pdf
    • http://kingwoodmusiclessons.com/uploads/1/3/0/2/130289565/notufonuzu.pdf
    • http://jetsettertravelinc.com/uploads/1/3/1/3/131379306/zoxeviguxixem.pdf
    • http://gesundheitsrehasport.de/uploads/1/3/1/4/131454459/bakidapagemap.pdf
    • http://wanderlustjewels.com/uploads/1/3/0/2/130272551/7853878.pdf
    • http://mspistone.com/uploads/1/3/0/2/130272414/2038773.pdf
    • http://theartofdonporter.com/uploads/1/3/0/9/130969477/toselutitogiwupi.pdf
    • http://wanderlustjewels.com/uploads/1/3/0/2
    • 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_off00006e27.bin
9fe757929fcc6fbb70481703df5b7cb2bc798f3a35fffc4199563e126c413970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E27 11240 bytes

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