Malicious PDF — malware analysis report

Static analysis result for SHA-256 347a736d1b162806…

MALICIOUS

PDF

47.3 KB Created: 2020-04-07 14:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e1926a6abaad3b7d6270327fe699999 SHA-1: b2a2b42e47d3889d72290c4fd68d095dd740fda0 SHA-256: 347a736d1b162806a8b762a1a6183226749db3a4a03c119f8c92a05b5ffed36e
94 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous other PDF files hosted on various domains. The document body, though partially obfuscated, contains a question about MS Word macros and embedded URLs, suggesting a social engineering tactic to entice users to click on malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external PDF links further supports this assessment.

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://mayasink.com/uploads/1/3/0/8/130873842/130873842.html#what+is+the+use+of+macro+in+ms+word+2007
    • http://wabashtees.com/uploads/1/3/0/4/130435622/nunifotupu.pdf
    • http://yerahmielbarylka.com/uploads/1/3/0/3/130313157/0c21d.pdf
    • http://edenonearthevents.com/uploads/1/3/0/4/130488539/9959777.pdf
    • http://rohinartgallery.com/uploads/1/3/1/0/131069934/edfae44d8d.pdf
    • http://hiraethculture.com/uploads/1/3/0/2/130288542/cae82585dd2.pdf
    • http://cleverchange.org/uploads/1/3/1/3/131383751/5546552.pdf
    • http://dietsdecoded.org/uploads/1/3/0/6/130620375/xexat_retitinidusema_jakepaduxa_galinotexe.pdf
    • http://funzoneskatecenter.com/uploads/1/3/0/6/130620520/togorupe.pdf
    • http://forplayindustry.com/uploads/1/3/1/3/131383594/belijetoxif_durewiwakexola_mezodegakifopim.pdf
    • http://teaganmurphymusic.com/uploads/1/3/1/4/131409244/jubisodagutew.pdf
    • http://perfectbalancehvac.org/uploads/1/3/0/5/130539270/gojevebedijavivafi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c11.bin
2c7f80840b778a0d47fa0a6bfd234fd5099bbdf51d1807673cf9b5b8c2dc76a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 7532 bytes
font_01_sfnt_off00009994.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9994 16036 bytes

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