Malicious PDF — malware analysis report

Static analysis result for SHA-256 f089f8e8ced3a133…

MALICIOUS

PDF

41.7 KB Created: 2020-04-02 06:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 358937bf460b8c856355572ae74ccd01 SHA-1: 4b2c5a4e7de1fac00dd9641ccc44f1450571c855 SHA-256: f089f8e8ced3a1334ddb945be7bf4b867efc0f8230b6ec22f82ad53a1a14653a
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, pointing to various PDF documents on different domains. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be a link farm, likely intended to manipulate search engine results or to serve as a distribution point for further malicious content. No scripts were extracted from this sample.

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://stacksapparelshop.com/uploads/1/3/0/6/130620792/130620792.html#que+es+el+humanismo+filosofia+resumen
    • http://disciplehouse.net/uploads/1/3/1/3/131379498/2292567.pdf
    • http://maleskincareblog.com/uploads/1/3/1/4/131406075/darokasimugizepojudi.pdf
    • http://cgoven.com/uploads/1/3/0/6/130621044/zegesufujibolobu.pdf
    • http://minnataylor.com/uploads/1/3/0/9/130969455/gelawir.pdf
    • http://mechx4.org/uploads/1/3/1/3/131398521/jixuxefutujutavewaro.pdf
    • http://janeyogaweb.com/uploads/1/3/0/7/130775228/vopoduzowezixado.pdf
    • http://apverify.com/uploads/1/3/0/7/130776105/9e7cf0e214.pdf
    • http://www.livefitterlivebetter.com/uploads/1/3/0/7/130775854/5249733.pdf
    • http://tiffanyfoster.ca/uploads/1/3/0/6/130620930/wegata_forolurobar_fizekupamuzezaf_fisugabirukiz.pdf
    • http://tanjaandersson.com/uploads/1/3/0/8/130813429/kitavusogofa.pdf
    • http://rrerealtyservices.com/uploads/1/3/0/2/130271054/acf1b.pdf
    • http://dignityandjll.com/uploads/1/3/0/8/130874409/231576.pdf
    • http://roilights.com/uploads/1/3/0/2/130289493/be4fe1578e303f4.pdf
    • http://aremco.net/uploads/1/3/0/6/130604561/xusozekikam_zogenodi_tegafomu.pdf
    • http://richalanphotography.com/uploads/1/3/0/5/130589103/rowekebadopunuxodev.pdf
    • http://romanbarrett.com/uploads/1/3/0/8/130813781/2396676.pdf
    • http://laqualitanellatuacucina.com/uploads/1/3/0/7/130738596/bedece2eecfe74.pdf
    • http://www.jessicajoy.com/uploads/1/3/1/3/131398431/tosubilijixoxefugaxo.pdf
    • http://drshriver.com/uploads/1/3/1/4/131438848/9635123.pdf
    • http://freedomfromthebanks.com/uploads/1/3/0/5/130550981/6915202.pdf
    • http://cofficurean.com/uploads/1/3/1/4/131453259/finusaza.pdf
    • http://oldsskatingclub.ca/uploads/1/3/1/3/131383698/5744860.pdf
    • http://marianails.net/uploads/1/3/0/5/130551245/ridawulepekavasuvi.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_off00007a7d.bin
da32996d4aa6a0b36ba016036221b065fd7ae523741d66aa6049bee89be248ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7D 8344 bytes

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