Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41bf59e7026a47e…

MALICIOUS

PDF

130.1 KB Created: 2020-04-22 20:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e43a985e1a25846d33cd1e969119035f SHA-1: ca4f865ad052776d793114acc03e4e54112ede50 SHA-256: f41bf59e7026a47efc486c5c7b41203b72ae2ef92e22a6601e26075330af1ddb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to legal demands and mentions wkhtmltopdf, suggesting it's a generated document designed to appear legitimate. The primary attack pattern involves leveraging these links to direct users to potentially harmful content.

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://bgcsjc.com/uploads/1/3/0/5/130547038/130547038.html#demanda+de+amparo+indirecto+pdf
    • http://cedgimoveis.com/uploads/1/3/0/9/130969391/wuzivile.pdf
    • http://cancunstanduppaddle.com/uploads/1/3/1/4/131437875/gazefe_lipejuti_bafitas_ligarizibozat.pdf
    • http://setthescenehomestaging.com/uploads/1/3/1/1/131163828/f6891a2.pdf
    • http://alsaeedarestaurant.com/uploads/1/3/0/6/130605498/pobixijun.pdf
    • http://demolitiondownersgroveil.com/uploads/1/3/0/6/130639329/9812412.pdf
    • http://reedfilmsphotography.com/uploads/1/3/0/4/130475923/lekop-noxuti-natubuxexa-lubidogaresuro.pdf
    • http://noviasdonelo.com/uploads/1/3/0/8/130813730/6759047.pdf
    • http://geosfotografia.com/uploads/1/3/0/6/130603926/kurugegopif-fisuvowasim-zusigezun.pdf
    • http://thegetaheadhouse.org/uploads/1/3/0/5/130590169/4ad116b608.pdf
    • http://tradertrainingtechnology.com/uploads/1/3/1/6/131607703/2702302.pdf
    • http://attorneyfloridaprobate.net/uploads/1/3/0/7/130775373/dekupufojevu.pdf
    • http://hcclonline.com/uploads/1/3/0/6/130604310/6234067.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_off0001d666.bin
26b6c104f88c6b08efa4bf804121f0ef15cd204e44491ee947938953a0bcfa2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D666 10144 bytes

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