Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3777b90e4d1bc26…

MALICIOUS

PDF

52.2 KB Created: 2020-03-15 12:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f5a388b37e7f9dd48065607a0e1bab9 SHA-1: 376d0d883268a9249fd59afb1584c4e65355af70 SHA-256: f3777b90e4d1bc26eb86e9ad00093c7555e9999a83a29e6ae5667c04a205d087
94 Risk Score

Malware Insights

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

This PDF file was generated by wkhtmltopdf and contains a large number of external links to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is an attempt to manipulate search engine results or distribute malicious content through a link farm. The embedded URLs and the ML classifier output support the malicious verdict.

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.guelaguetzaintercultural.org/uploads/1/3/0/6/130604987/130604987.html#minions+2015+sub+indo+480p
    • http://treatsbyleets.com/uploads/1/3/0/2/130270863/5247944.pdf
    • http://vegantogosxm.com/uploads/1/3/0/9/130969852/7868153.pdf
    • http://qileyulecheng.f18.ebkf.org/uploads/1/3/0/2/130271096/wakagebuvemedur-xolapatej.pdf
    • http://redbrookcarpentry.com/uploads/1/3/0/8/130813992/vubexefametagu_voritijexipil_tupobeleguliso.pdf
    • http://raptordj.org/uploads/1/3/0/5/130541688/bapagegeka.pdf
    • http://heloisecrista.com/uploads/1/3/0/7/130776490/ab76b04a2664.pdf
    • http://appleglade.com/uploads/1/3/0/7/130775015/99d956502c.pdf
    • http://www.csgtennisclub.co.uk/uploads/1/3/0/8/130874063/jidibufebelujaj_vewoxaz.pdf
    • http://mta-sts.mail.bridgeportpta.org/uploads/1/3/0/7/130776481/6523898.pdf
    • http://5toolgroup.com/uploads/1/3/0/7/130738936/7456923.pdf
    • http://gardensalonpasadena.com/uploads/1/3/0/7/130775260/jeveduxigukezo.pdf
    • http://prettysimpleorganizing.net/uploads/1/3/0/7/130775370/3445be5.pdf
    • http://mrcrosbyswebsite.com/uploads/1/3/0/7/130740490/sagenumeg.pdf
    • http://kaiserparmenente.org/uploads/1/3/0/4/130483146/4148eba185.pdf
    • http://360casecamp.com/uploads/1/3/0/5/130588199/f01b61bda2a6a.pdf
    • http://luchoespinoza.com/uploads/1/3/0/6/130620952/c8b77043bb3f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000a047.bin
f0e06e0c7ede7d0ed17d501d10d070d5081dc1decb47368f44f8fa7a131d5d39
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA047 20092 bytes
font_00_sfnt_off0000761f.bin
91d3111c79cffa20ff160c8393ae79d964edcc3d27baaad4f305fe778d005e22
pdf-font-stream PDF embedded font (sfnt) at offset 0x761F 8556 bytes
font_01_sfnt_off00009714.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x9714 2604 bytes