Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3c70113f16bc0c…

MALICIOUS

PDF

39.3 KB Created: 2020-03-13 17:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dee7fe44a88aa6e6a95d68da54773199 SHA-1: 0d1a00d83b179d2ed4c0055657051d887e02f053 SHA-256: 1c3c70113f16bc0c2232288ad7d2c4dfc49d6a7f2689174bd12a2bbe22914cb0
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text is heavily obfuscated and does not provide clear user-facing content, but the presence of numerous links suggests a lure to external, potentially malicious, websites. The primary attack pattern involves directing users to these external resources.

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://www.jameswalkercomposer.com/uploads/1/3/0/6/130622059/130622059.html#how+to+set+font+size+in+itext+pdf+c
    • http://lcgcabinets.com/uploads/1/3/0/8/130874674/8619096.pdf
    • http://insighteditingservices.com/uploads/1/3/0/2/130291579/zudid_tipemu_zufuzevepe_dijogokoxav.pdf
    • http://dal-ma.com/uploads/1/3/0/6/130620538/c9d0ce46f0b.pdf
    • http://livingwhollyme.com/uploads/1/3/0/8/130874304/rojolot.pdf
    • http://www.sondikakoaukera.com/uploads/1/3/0/6/130620818/jufulogixejev.pdf
    • http://jonijohnston.com/uploads/1/3/0/2/130288630/melapol_gojerelu.pdf
    • http://volutesdeparis.org/uploads/1/3/0/4/130476310/f3b909290be.pdf
    • http://boogetown.ca/uploads/1/3/0/5/130540461/a68fb6a.pdf
    • http://voreckapp.com/uploads/1/3/0/4/130476574/tukewevonoluromure.pdf
    • http://noelproductionsllc.com/uploads/1/3/1/0/131070387/fitizexinajitov-maposobusozugen-puxosota-fedunofox.pdf
    • http://lgbelectricalcontracting.net/uploads/1/3/0/6/130620986/pisakat.pdf
    • http://starryrey.com/uploads/1/3/0/6/130639580/4731048.pdf
    • http://fitnesswitness.com/uploads/1/3/0/5/130550970/b316201ea0ccb17.pdf
    • http://trainerblueprint.com/uploads/1/3/0/5/130589010/7017089.pdf
    • http://minjukim.com/uploads/1/3/0/5/130588980/3646406.pdf
    • http://striving4excellence.net/uploads/1/3/0/6/130639561/zarapuj-sorakijabutegex-wuwidozag.pdf
    • http://www.trailblazerlabs.com.au/uploads/1/3/0/6/130621055/dagofumejire_fufoleje_jexofeloturo_jisijuzi.pdf
    • http://ntxsportswear.com/uploads/1/3/0/2/130272452/99cdeaac241.pdf
    • http://ridgelineohio.com/uploads/1/3/0/4/130488251/0861b.pdf
    • http://lifesolutionforever.org/uploads/1/3/0/5/130539113/6166822.pdf
    • http://huntsvilletexasattorney.com/uploads/1/3/0/3/130313286/016edcf5d7af61a.pdf
    • http://wb2129.com/uploads/1/3/0/6/130639526/dowasakekoxojepip.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_off00007097.bin
21cd95ec83f58998ca6bed9795af4da5af5be9ac4f1e95d3f131f72a5b14b83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7097 7900 bytes

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