Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3091d22116058f2…

MALICIOUS

PDF

43.4 KB Created: 2020-03-14 11:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1394acfadec03da50ab6f01bbc172bb7 SHA-1: 7ce4673298819296a276b5c90c86d4d154c36f8e SHA-256: c3091d22116058f224fb35b9aca7f9518260a50ab7a63c7f275d6502d0b6cd98
94 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, masquerading as answers to a mechanical comprehension test. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a large number of external links, suggesting a link farm or redirection scheme. The primary URL, http://74-123-72-191.mgwnet.com/uploads/1/3/0/5/130541285/130541285.html#shl+mechanical+comprehension+test+answers, is likely the initial lure.

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://74-123-72-191.mgwnet.com/uploads/1/3/0/5/130541285/130541285.html#shl+mechanical+comprehension+test+answers
    • http://mail.pimpmybike.org/uploads/1/3/0/3/130313564/050ca5c7403e.pdf
    • http://www.coachingcommoncents.com/uploads/1/3/0/2/130271054/najenugejatuwetotijo.pdf
    • http://memartopla.site/uploads/1/3/0/5/130590665/b6b8955aea4bfc9.pdf
    • http://hairbyheirgroom.com/uploads/1/3/1/0/131070238/8184631.pdf
    • http://nathaniel-gaynor.com/uploads/1/3/0/3/130379457/nomik.pdf
    • http://www.themortgageteam.org/uploads/1/3/0/5/130589010/ralabawalowajo.pdf
    • http://armsofoblivion.com/uploads/1/3/0/4/130488295/tokezabazur-lolotinefe-jabizij.pdf
    • http://meganoloughlincreative.com/uploads/1/3/0/5/130551342/1897731.pdf
    • http://therapycenterofnewyork.com/uploads/1/3/0/6/130640139/rezazupafoga.pdf
    • http://leprojetdememoire.com/uploads/1/3/0/3/130379514/3230944.pdf
    • http://lgmyersconstructionllc.com/uploads/1/3/0/4/130476485/kudawir.pdf
    • http://unfinishedprayers.org/uploads/1/3/0/6/130620792/kupasujupafuw.pdf
    • http://aakenbaakenandkent.com/uploads/1/3/0/5/130588395/4224566.pdf
    • http://manjarazie.online/uploads/1/3/0/6/130639166/254cf8ed5e80a0.pdf
    • http://renaissanceresearch.org/uploads/1/3/0/6/130639059/zumojuf.pdf
    • http://mail.alessandrobrighetti.com/uploads/1/3/0/4/130436050/daregaloforuti.pdf
    • http://mta-sts.mx.islandukulele.org/uploads/1/3/0/8/130814774/6cfe3f.pdf
    • http://sewakholding.com/uploads/1/3/0/6/130639199/d36cab8089869.pdf
    • http://kamloopsroofer.com/uploads/1/3/0/9/130969478/lososodajawad-miromujepesu-gujexomujotijo.pdf
    • http://www.canilmontreal.com/uploads/1/3/0/5/130588560/kopivozulidiwapi.pdf
    • http://www.carboxy.net/uploads/1/3/0/6/130604105/baxos.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_off00007f04.bin
7fb42cd7a01b9de0c8d3f1fd38fe656f5eee23de98b664a6241972fa34ee3a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F04 8472 bytes

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