Malicious PDF — malware analysis report

Static analysis result for SHA-256 022b32cb99b2ef12…

MALICIOUS

PDF

53.5 KB Created: 2020-03-25 10:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 60728949aca7d4f7fb093171b04e7b4b SHA-1: a2378adb0dd44f4eb27250371de5dd210594dc6d SHA-256: 022b32cb99b2ef125269c909784d4a1de225dd3c913d0d7e860fca2c933c982f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many with numeric slugs, indicative of a link farm or SEO poisoning tactic. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest malicious intent. The document body, though partially corrupted, contains a URL that likely leads to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://suppy-taiwan.com/uploads/1/3/0/2/130271205/130271205.html#otter+street+fishing+tournament+2019
    • http://johnhenryfox.com/uploads/1/3/0/7/130739621/negibovinunofi_fupanes_bogaduzipepepom_gofopadutepuse.pdf
    • http://foremanhillroadsidestand.com/uploads/1/3/0/5/130588290/76118a707bdf.pdf
    • http://familyunitedservicesinc.org/uploads/1/3/0/5/130588377/77714890544.pdf
    • http://alteats.net/uploads/1/3/0/5/130590322/660143.pdf
    • http://www.jeromesvintage.club/uploads/1/3/0/8/130814596/tagazi.pdf
    • http://www.extratime.life/uploads/1/3/0/7/130738806/xokosopeli-suxad-fifikadokaxu.pdf
    • http://ashleywebernd.com/uploads/1/3/0/6/130604508/5556704.pdf
    • http://boebaiyulechengzhuce.br3h.com/uploads/1/3/0/7/130776350/xalefedixug.pdf
    • http://eatingnaturally.com/uploads/1/3/1/0/131070590/labaval.pdf
    • http://sigma6ix.org/uploads/1/3/0/2/130287813/kibuxex.pdf
    • http://autodiscover.heidelbergcycling.co.za/uploads/1/3/0/6/130604778/mibazusunutu.pdf
    • http://www.lauraldunnesq.com/uploads/1/3/0/5/130588370/dobewizano.pdf
    • http://dwellingdoctors.net/uploads/1/3/0/6/130621903/wojopufofafefikidi.pdf
    • http://ohhousecleaners.com/uploads/1/3/0/4/130478709/muguxoxeginukepuv.pdf
    • http://churchesindeerpark.org/uploads/1/3/0/7/130775889/bitigogubow.pdf
    • http://mindfulday.org/uploads/1/3/0/2/130272506/6981801.pdf
    • http://sepryca.com/uploads/1/3/0/5/130588633/73c1dd09e04a525.pdf
    • http://www.riyasnails.net/uploads/1/3/0/6/130620890/f22eb4ec7d718.pdf
    • http://www.caringhandsmovingfoward.com/uploads/1/3/0/6/130620399/dulijisadetola.pdf
    • http://thewardgroup.info/uploads/1/3/0/4/130435596/fitafelun.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_off000095db.bin
d75d9351637d28e2aae6b8400496724f1097159c8020e5f7f00b1395a5db2651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95DB 8468 bytes
font_01_sfnt_off0000b675.bin
bdde9b4cc85332db6092d0d2f03002d519bedb0d5bff3aa02ffca013742316a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 5716 bytes

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