Malicious PDF — malware analysis report

Static analysis result for SHA-256 98099fe3ed7fd245…

MALICIOUS

PDF

53.7 KB Created: 2020-04-11 23:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec02c32136b7fb5e1a374f338db44289 SHA-1: 936d2b02136dfe78c5e584434f7b0b8dfdd42f7c SHA-256: 98099fe3ed7fd245fff366d69eaa03444aeba8b6555431291b6eb4dfea8c9bf5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are dynamically generated with numeric slugs, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a reference to 'Mapamundi con todos los nombres de los países' and the wkhtmltopdf generator, suggesting a lure to external content.

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://etceterawellness.com/uploads/1/3/0/5/130543318/130543318.html#mapamundi+con+todos+los+nombres+de+los+pa%C3%ADses
    • http://stepsministries.me/uploads/1/3/0/6/130620666/5866624.pdf
    • http://baysideoakland.com/uploads/1/3/0/4/130435590/vibixul_bokololoje_jazokobuzidugit.pdf
    • http://meaghanherstad.com/uploads/1/3/1/4/131437636/xegekabiz-bubowifokipo-lusuware.pdf
    • http://pshswildcatlax.com/uploads/1/3/0/4/130478819/3994128.pdf
    • http://dianalangell.com/uploads/1/3/1/4/131437702/6871083.pdf
    • http://chiledelquepica.com/uploads/1/3/0/4/130490643/ca352fa849b5717.pdf
    • http://tonyasdayspa.com/uploads/1/3/0/3/130323743/8c9bdd12ffe.pdf
    • http://defence21.net/uploads/1/3/0/7/130776402/kopezusogi-bovijewogu-jebozupomekoj-tafitanugutexub.pdf
    • http://retrofitpersonaltraining.com/uploads/1/3/1/0/131071082/gavefozemufetuwefa.pdf
    • http://arfpetfoods.ca/uploads/1/3/0/7/130740113/3211061.pdf
    • http://stepsministries.me/uploads/1/3
    • 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_off000094aa.bin
496fd052b64637ce584285bb8868912e37102417ffd754c122ee0e48e21385ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94AA 10032 bytes
font_01_sfnt_off0000b826.bin
683c31aaec5e0696ba15efe129d6a50302a40b469242c7c2921a7ada6bb96704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 4516 bytes

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