Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36f13db684dd5d0…

MALICIOUS

PDF

57.2 KB Created: 2020-03-25 08:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32d2d3d5016672a12db34f839c82900f SHA-1: 13540a9a75d0ff14288ab416d92a69331552ed8c SHA-256: b36f13db684dd5d046538a1e5fafb735eb568202cd5fcf7ceabd0e1c9160faa0
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, many of which are SEO-optimized and appear to be part of a link farm. The primary heuristic, PDF_SEO_LINK_FARM, indicates that the document's purpose is to direct users to a multitude of external websites, likely for malicious purposes such as phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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://witherlysgreenhouse.com/uploads/1/3/0/6/130604552/130604552.html#navy+cpo+dress+uniform
    • http://mike-at-play.com/uploads/1/3/0/9/130969465/92caa854a10.pdf
    • http://mvbruinsoccer.com/uploads/1/3/0/6/130620986/8937556.pdf
    • http://www.michaelroll.net/uploads/1/3/0/5/130538931/fawulurupogi.pdf
    • http://74-123-76-129.mgwnet.com/uploads/1/3/0/5/130588778/xokixamowowukisujobe.pdf
    • http://prematuresolutions.com/uploads/1/3/0/7/130776341/zomufigezosef_kudomisu_safezabipuz_zafar.pdf
    • http://expresslockinc.com/uploads/1/3/1/0/131069992/relidirebogibon.pdf
    • http://www.otairving.com/uploads/1/3/0/6/130621294/8863410.pdf
    • http://cbpmeeps77.com/uploads/1/3/0/4/130483198/9392384.pdf
    • http://stephenrosinski.com/uploads/1/3/0/6/130639653/dowugutukaves.pdf
    • http://webmail.areturntoliberty.com/uploads/1/3/0/6/130604162/puvazojifepifuruva.pdf
    • http://imperiumdesign.net/uploads/1/3/0/6/130639214/labarimozafitu.pdf
    • http://www.stenepme.net/uploads/1/3/0/4/130478205/bibezebaruja-desom-wawisazumanajos.pdf
    • http://www.crosswoundsfoundation.org/uploads/1/3/0/6/130639413/ebf1284f27c3b7c.pdf
    • http://www.clkfarm.com/uploads/1/3/0/4/130483745/3543366.pdf
    • http://southernstripes.org/uploads/1/3/0/6/130639976/b976fe8.pdf
    • http://kinderortelfenweg.ch/uploads/1/3/0/6/130639664/vimoluje.pdf
    • http://denverpaintingservice.com/uploads/1/3/0/2/130289734/80dfa.pdf
    • http://www.mybudgetmate.com.au/uploads/1/3/0/6/130621351/gerufupuwisafi.pdf
    • http://bettersydney.org/uploads/1/3/0/6/130620958/piwitonivopepiwevik.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_off0000b6cf.bin
e586f444e6f18fef239c2b249ae4021e8906691ddf4b014d8710c9f4b3bd80d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 8460 bytes