Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c1944d93d093c2…

MALICIOUS

PDF

38.9 KB Created: 2020-03-29 04:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 971d6709c162792804826d4faf85812f SHA-1: 2d81a56656aef4e22d7b047cce9cace6bd4dbaf6 SHA-256: a4c1944d93d093c215f8f750fa57535891669f2329f3f288208145c4ac379f4b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The primary lure appears to be product-related, as seen in the document body and one of the extracted URLs. No scripts were extracted from this sample, limiting the analysis of direct payload delivery mechanisms.

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://74-123-78-254.mgwnet.com/uploads/1/3/0/7/130740562/130740562.html#hoover+steam+express+handheld+steam+cleaner+ssnh1000 PDF link annotation
    • http://wwwgarvans.com/uploads/1/3/0/5/130590030/dafisuzurojuju.pdfIn PDF document text
    • http://onehundredrobotslab.com/uploads/1/3/0/3/130379051/1521370.pdfIn PDF document text
    • http://twomachines.org/uploads/1/3/0/4/130483821/nijinatoxepuj.pdfIn PDF document text
    • http://ccprofessionaltaxservices.net/uploads/1/3/0/2/130272579/varino-xesabajoxuvem.pdfIn PDF document text
    • http://doveshanksbitters.com/uploads/1/3/0/2/130271121/repalamo.pdfIn PDF document text
    • http://martinasmithconsulting.org/uploads/1/3/1/1/131164223/xifov-majegiwoti-notasalabejev.pdfIn PDF document text
    • http://limo-austin.net/uploads/1/3/0/4/130476709/rojifomaxut-sedimitip.pdfIn PDF document text
    • http://www.betterhealthsupport.net/uploads/1/3/0/5/130543772/8673742.pdfIn PDF document text
    • http://mrvangeelsclass.com/uploads/1/3/0/2/130291996/3720427.pdfIn PDF document text
    • http://alicesnurserycenter.com/uploads/1/3/0/8/130874333/simeve.pdfIn PDF document text
    • http://50klawn.net/uploads/1/3/0/4/130483939/fawebukumi.pdfIn PDF document text
    • http://unitaxcpa.com/uploads/1/3/1/4/131407253/3f45d4b9be2f.pdfIn PDF document text
    • http://lwcalifornia.com/uploads/1/3/0/8/130874360/82dcf4.pdfIn PDF document text
    • http://vegasjunkmovers.com/uploads/1/3/0/5/130589031/4895cb5e4025.pdfIn PDF document text
    • http://howardmarling.com/uploads/1/3/0/5/130589435/8018522.pdfIn PDF document text
    • http://www.fullcircleexpression.com/uploads/1/3/0/2/130287211/531430.pdfIn PDF document text
    • http://rentalsandroomates.net/uploads/1/3/0/6/130605229/risibem.pdfIn PDF document text
    • http://11misconceptions.com/uploads/1/3/0/2/130272918/wejamij-fosodagikova.pdfIn PDF document text
    • http://dashijieyulechengpingji.br3h.com/uploads/1/3/0/7/130776760/660615.pdfIn PDF document text
    • http://eliarbel.com/uploads/1/3/0/6/130639911/tewuk.pdfIn PDF document text
    • http://cuberexpress.club/uploads/1/3/0/2/130272355/pawozasubuler_regexalini_livoranoxuga_vigigikafibira.pdfIn PDF document text
    • http://www.dwcmanagement.com/uploads/1/3/0/8/130814208/4236461.pdfIn PDF document text
    • http://dariobova.com/uploads/1/3/0/8/130813366/5465212.pdfIn PDF document text
    • http://cardenschooltehachapi.org/uploads/1/3/0/2/130291415/3048090.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 7872 bytes
SHA-256: fda09a5d0aa8a608e83c53c26c43fd1b4e32d188537abcad7373def3d0c6ad7e

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