Malicious PDF — malware analysis report

Static analysis result for SHA-256 27471112ce59b725…

MALICIOUS

PDF

39.7 KB Created: 2020-03-16 06:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 103498f813508bb8c45e7d8f74b0414a SHA-1: 17b96f5c6bc7a2445a8a51af4fb0987922762d5b SHA-256: 27471112ce59b725759c9bb3304386129063d1be0e43383ca863c69e2229f4df
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to redirect users to potentially malicious content hosted on these external sites.

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://hostmaster.salon225.com/uploads/1/3/0/4/130483337/130483337.html#braun+thermoscan+manual+irt+6020
    • http://worldlywriting.com/uploads/1/3/0/7/130776536/5554427.pdf
    • http://theheadstand.co.uk/uploads/1/3/0/5/130588502/1461094.pdf
    • http://bookingyourholiday.com/uploads/1/3/0/4/130488252/1197876.pdf
    • http://barrelvisions.com/uploads/1/3/0/5/130550731/727412.pdf
    • http://veteranhillhops.com/uploads/1/3/0/3/130313272/86d70450d6a9.pdf
    • http://www.leatherrepaircompanyireland.com/uploads/1/3/0/6/130621292/kulinugofi-resalopupunuja-gafowemagaxij.pdf
    • http://ecotronicks.com/uploads/1/3/0/8/130813639/fiwod-kisub-zunak-superewalirebof.pdf
    • http://www.utuppercervical.net/uploads/1/3/0/6/130620668/5313056.pdf
    • http://andersoncapsim.com/uploads/1/3/0/4/130488834/e0f07f19cad6.pdf
    • http://mta-sts.nuortenhoitopiste.com/uploads/1/3/0/5/130589102/9072970.pdf
    • http://automaticpocketdoor.com/uploads/1/3/0/5/130550667/tenegaxogiduvopegige.pdf
    • http://johnnyryanmusic.com/uploads/1/3/0/4/130476652/pezurabaf.pdf
    • http://thejoyoftheliving.com/uploads/1/3/0/6/130620684/be7ed.pdf
    • http://screenlo.com/uploads/1/3/0/3/130324004/jaxudapezawid.pdf
    • http://michaelrekas.com/uploads/1/3/0/8/130874559/midujes_tivon_besibekolinotej.pdf
    • http://oxfordsupertutors.com/uploads/1/3/0/6/130621208/e9cfd55387.pdf
    • http://rebeccaword.com/uploads/1/3/0/5/130588954/jilotanobagu.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_off00007044.bin
1cc2e7aed70a40d94e25c588c79702eb3a571a439eaffef5d8cdb4583955f541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 8756 bytes

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