Malicious PDF — malware analysis report

Static analysis result for SHA-256 33521abdc1e7927d…

MALICIOUS

PDF

43.4 KB Created: 2020-06-17 21:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1bf0b4819b247d3185399ab7ade33db SHA-1: 11d79ea5134152a415b9b7b8d809536052612176 SHA-256: 33521abdc1e7927d27ecb9dc088391186a0fea46332645a85ddc3398f7546074
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous links to unrelated domains suggests a link farm or redirection scheme. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://ashfieldgreenfieldpsyhotherapy.solutions/uploads/1/3/0/3/130323642/130323642.html#mathematics+definition+pdf
    • http://carpetcleaningsv.com/uploads/1/3/0/6/130605292/2995421.pdf
    • http://acaringtherapy.com/uploads/1/3/1/4/131438709/papotodawovone.pdf
    • http://cas9i.com/uploads/1/3/0/5/130542831/bd72f5a0c9a828.pdf
    • http://harlancircle.com/uploads/1/3/0/6/130639084/dubimewinojekef-zebokuk-goxadizo-rojuzegokizoxa.pdf
    • http://foxvalleybikefit.com/uploads/1/3/0/6/130604793/xijufo-kasevat-wanagej-bijuwixaji.pdf
    • http://conditionedstrength.com/uploads/1/3/0/7/130776367/5849645.pdf
    • http://mta-sts.mail.meetthemessenger.com/uploads/1/3/0/9/130969221/2966009.pdf
    • http://mail.browbeginnings.com/uploads/1/3/0/8/130815381/mofekud.pdf
    • http://jacquelinestine.com/uploads/1/3/0/5/130551127/a1619aef.pdf
    • http://justswapp.it/uploads/1/3/1/3/131380322/dutijexosukek.pdf
    • http://lizreinertson.com/uploads/1/3/1/3/131383726/dogoguwutuguluv.pdf
    • http://ruffles-and-rust.com/uploads/1/3/1/3/131383708/e1cd463.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_off00006b5a.bin
662db7ec6ec224815b8f498e59ffb4af8d208a1d44fd01a7b3875aaffb008e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5A 5060 bytes
font_01_sfnt_off00007c6f.bin
2278ab970b29fa4024b2f1f316d88ceae2cbd2ce1e49395923dd843f2aca27b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6F 10456 bytes

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