Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3b22cdb25284ea…

MALICIOUS

PDF

36.5 KB Created: 2020-03-20 09:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 302b129bb005f9d6050fb5c20826e73e SHA-1: 62a4e10a732f2149a7cc8db75bf480510ea53201 SHA-256: 9c3b22cdb25284ea5d0d59650ccbb59a7397310b05dd2a35ac724a0aa305e91d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This pattern suggests the document is likely part of a link farm or SEO manipulation scheme, potentially used to distribute further malicious content or to artificially inflate search engine rankings.

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://thecoloradowitch.com/uploads/1/3/0/8/130874648/130874648.html#kill+a+watt+ez+p3+instructions
    • http://wellesleypublicmedia.com/uploads/1/3/0/8/130813054/sorutibulabi.pdf
    • http://thankorchange.org/uploads/1/3/0/6/130605440/3303864.pdf
    • http://xora.institute/uploads/1/3/0/6/130604213/8728293.pdf
    • http://boutiquehotelsbangkok.com/uploads/1/3/0/7/130738667/pobakap.pdf
    • http://tvwithoutcable.com/uploads/1/3/0/7/130740316/rozetejibodateneti.pdf
    • http://northforkinfo.net/uploads/1/3/0/3/130379529/2738035.pdf
    • http://rpglayout.com/uploads/1/3/0/6/130604114/6ee51cc.pdf
    • http://vinloan.com/uploads/1/3/0/7/130738764/bc23b3bd.pdf
    • http://kennedyskollections.com/uploads/1/3/0/5/130544390/seroxavugata_jifew_tolibufatiwezi_webudiguros.pdf
    • http://advontech.com/uploads/1/3/0/2/130288348/fukabagot_lixewixafamun_bitosomifumol_tesad.pdf
    • http://www.storemthemeswp.net/uploads/1/3/0/4/130436094/gogolawuf.pdf
    • http://moms-space.net/uploads/1/3/0/5/130550983/6535177.pdf
    • http://www.joncoxwellart.com/uploads/1/3/0/6/130639228/6325993.pdf
    • http://organik-zeytinyaglari.com/uploads/1/3/0/6/130640181/5394095.pdf
    • http://stuccorepairbrothers.com/uploads/1/3/0/6/130603859/vumelitijeferur.pdf
    • http://connectedsystems.io/uploads/1/3/0/2/130272985/dezipewe.pdf
    • http://dickehead-drivers.com/uploads/1/3/0/6/130604126/0ee08400.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_off00005bd1.bin
c404aca4ad20430cf9eba218c96dcd04c0e666024f0ab16c460281d8240e8261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD1 8144 bytes
font_01_sfnt_off00007b28.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B28 2616 bytes

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