Malicious PDF — malware analysis report

Static analysis result for SHA-256 251c0c6c28758186…

MALICIOUS

PDF

47.3 KB Created: 2020-05-21 06:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ebc374e9d9b94bbbca2b4763d02aa0 SHA-1: 15c636412c9bd70cff0d238b19060c728659ade5 SHA-256: 251c0c6c28758186e735a3ae61e1c73897d19627721870a9e6f056c79f5a849b
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to a recipe and the wkhtmltopdf tool, but the primary malicious activity appears to be the extensive link farm, likely intended to manipulate search engine results or redirect users to malicious content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bridgestreampublishing.com/uploads/1/3/0/7/130738603/130738603.html#orelhas+de+carnaval+receita+tradicio
    • http://garwoodproductions.com/uploads/1/3/1/6/131636719/5986750.pdf
    • http://tidalindustries.com/uploads/1/3/0/5/130551670/wazuziwus.pdf
    • http://australianchartsreport.com/uploads/1/3/0/6/130621447/14a44.pdf
    • http://bullardinsuranceservices.com/uploads/1/3/1/4/131454114/mazav_tuzozuleted.pdf
    • http://jeredonoconner.com/uploads/1/3/0/9/130969746/3841806.pdf
    • http://cdiviaq.com/uploads/1/3/0/8/130814360/rewuwo.pdf
    • http://jadehindmon.com/uploads/1/3/1/3/131398424/sudogepedodusi.pdf
    • http://kck9detection.com/uploads/1/3/0/6/130639424/vetinipowodew.pdf
    • http://prominentog.com/uploads/1/3/0/7/130739537/8bd976098.pdf
    • http://unitenergy.org/uploads/1/3/0/3/130379218/fovofenus-pedizudaraf-nakinege-parikabaroz.pdf
    • http://thegoods-bakery.com/uploads/1/3/0/6/130604765/tusavelabazup.pdf
    • http://kauaipilatescoach.com/uploads/1/3/1/3/131398017/dokubusar.pdf
    • http://echfilms.com/uploads/1/3/1/8/131857029/xofepasokimaxes_rijagumuxit.pdf
    • http://assertiv-kommunikation.dk/uploads/1/3/0/5/130543134/9d9a696969488eb.pdf
    • http://threepsclothing.com/uploads/1/3/0/6/130639087/c2fce3b98de9e.pdf
    • http://perthcards.com/uploads/1/3/1/8/131871479/0af2c7.pdf
    • http://shoptopsttar.site/uploads/1/3/1/4/131408502/edc4bd2e8927.pdf
    • http://fabulousredstars.com/uploads/1/3/0/9/130969699/1077939.pdf
    • http://skinsolutionsbykelly.com/uploads/1/3/0/3/130379411/petanunuxis.pdf
    • http://sirenessong.com/uploads/1/3/0/4/130476912/nubomotu_vekaguzi_xutevonowogen_bodoliro.pdf
    • http://laserhairremovalspanyc.com/uploads/1/3/0/5/130540642/vakirexedulelopa.pdf
    • http://westcoastretractablescreens.net/uploads/1/3/1/4/131411596/vemusi-zurudunuwojoba-kedunebozatev.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_off000071cd.bin
315b54a2b94c1409ad87bc4adbda4222837ce8d606e1247704d3cfafc5666d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 13636 bytes
font_01_sfnt_off00009a4e.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 16060 bytes

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