Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bba52572eebf3e…

MALICIOUS

PDF

98.3 KB Created: 2020-03-21 13:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f3ab974d1389552bb03ca6785d9468f SHA-1: ed5ba6fcf9a0edc0b79df7dd3ea5224049f3377c SHA-256: a2bba52572eebf3e0dd2ce1789435e46d436330f9766e93d0e07b17d0b5dcadb
94 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, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm behavior.

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://soulfocuswellnesscenter.com/uploads/1/3/0/7/130775002/130775002.html#la+cantante+calva+pdf+eugene+ionesco
    • http://purlzz.com/uploads/1/3/0/2/130289392/gamasadewarulunimid.pdf
    • http://cannotclose.com/uploads/1/3/0/5/130588596/46d211e40bab3cd.pdf
    • http://www.livingfromyourinnercore.com/uploads/1/3/0/8/130874194/jolopol.pdf
    • http://katyspencer.com/uploads/1/3/0/5/130540240/7938906.pdf
    • http://www.cuddle-tees.com/uploads/1/3/0/4/130488700/pozesobokixu-tifogapokovozem.pdf
    • http://chilyn.net/uploads/1/3/0/6/130604775/7834765.pdf
    • http://www.tankchairextreme.com/uploads/1/3/0/7/130739012/fofepomojop-lopivileme-numugolawar-lixotidapiliki.pdf
    • http://pathproduct.com/uploads/1/3/0/4/130483303/diwejigiri.pdf
    • http://www.agl-industries.com/uploads/1/3/0/4/130476294/lowaxipadeto-watezaforumu-jofebipumurelu.pdf
    • http://cashdealsmichigan.com/uploads/1/3/0/3/130313641/7489558.pdf
    • http://leahwoods.net/uploads/1/3/0/6/130620519/nubupobobe-geludokefu.pdf
    • http://www.minneapolis1934.info/uploads/1/3/0/2/130288986/9241d.pdf
    • http://www.glean-consulting.com/uploads/1/3/0/4/130483728/4162508.pdf
    • http://creevanracing.com/uploads/1/3/0/6/130621158/jagor_badigokoj.pdf
    • http://webmail.resetandrenewyoga.com/uploads/1/3/0/7/130738603/01ae3d04a.pdf
    • http://morningsunshinebath.com/uploads/1/3/0/5/130545954/senososoxa_nejarafap_kotada_telopuxav.pdf
    • http://medatisltd.com/uploads/1/3/0/5/130590030/e0ac19a100.pdf
    • http://www.masoncitychristian.org/uploads/1/3/0/3/130323998/tuniguxidunezos-foroxasabumun-lumepiwinuzu.pdf
    • http://27000grainsdecafe.ca/uploads/1/3/0/6/130604129/7686472.pdf
    • http://metropolis-exc.com/uploads/1/3/0/5/130540282/lijoxuno.pdf
    • http://glynnsclips.com/uploads/1/3/0/4/130483856/1419504.pdf
    • http://bonfirecreative.org/uploads/1/3/0/2/130271054/tadajazubiwu-mututiluf-dopexiral.pdf
    • http://50klawn.net/uploads/1/3/0/7/130776114/1309310.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001355d.bin
105fdef945cc70f1fdf0028017cecfe26a60cd394dee1787e37044518ed5e78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 11112 bytes
font_01_sfnt_off00015a92.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A92 2652 bytes
font_02_sfnt_off000163f9.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163F9 16036 bytes

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