Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e0587faa71d737…

MALICIOUS

PDF

41.8 KB Created: 2020-05-20 03:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac213de95f1b0a027aad4e991772fa4 SHA-1: 47f815d2650eea96a11c73115e0637aede485b1e SHA-256: b3e0587faa71d737323e0b7ced61aed3467f6cfa16ddb28e1f83070496c3630a
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to numerous PDF files hosted on various domains, suggesting a link farm or distribution network. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of numerous external links is the primary indicator of malicious intent.

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://chewoncakes.com/uploads/1/3/0/2/130271184/130271184.html#ulnar+nerve+flossing
    • http://elmanibrahimoqlu.com/uploads/1/3/1/8/131856627/xonadezonajo_newererurodif_xugasenun_mumaz.pdf
    • http://managereletroetech.com/uploads/1/3/1/0/131071157/9226492.pdf
    • http://hicksandsonsatl.com/uploads/1/3/0/2/130272233/votixusi_tozufiwewop.pdf
    • http://geolocationz.net/uploads/1/3/1/4/131454207/sajujuretol-badowivozazi.pdf
    • http://ixylabs.com/uploads/1/3/0/8/130874222/gifejopevevexadedol.pdf
    • http://fecapital.org/uploads/1/3/0/7/130740186/bawovel.pdf
    • http://themadisonphotos.com/uploads/1/3/0/3/130379458/185f4aaf780b70.pdf
    • http://cousino.app/uploads/1/3/1/0/131070883/d1e8f59c082f.pdf
    • http://wernerleads.com/uploads/1/3/0/9/130969555/2336645.pdf
    • http://theinsuranceguy.agency/uploads/1/3/0/7/130738710/bapenoleg.pdf
    • http://nancyzhang0313.com/uploads/1/3/0/4/130483616/f58f87d49.pdf
    • http://androidfreemusic.com/uploads/1/3/1/3/131384127/4aa2dc302.pdf
    • http://ecoreflection.info/uploads/1/3/0/4/130488396/zibiwipofe_fesibomuli_vebuzesavanid.pdf
    • http://alisonlawrence.com/uploads/1/3/0/5/130540097/pofagemavim.pdf
    • http://six10digital.com/uploads/1/3/0/6/130621278/genigemigonado-merelerexaj-bamikunavu.pdf
    • http://silviaperezinsurance.com/uploads/1/3/0/8/130874111/lukixigesaso-fuxixuku-pulemenunalufe.pdf
    • http://meetrobyn.com/uploads/1/3/0/7/130775866/6272010.pdf
    • http://dgrealtygroup.org/uploads/1/3/1/4/131409616/nurotimiduxalar-jesen-pavirezumu-suvujexipikisu.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_off00007884.bin
42b999e6cb249c6eba87c22f2d2a42c09fad6401cfe18d0760f4bb7fbb60a69d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 10320 bytes