Malicious PDF — malware analysis report

Static analysis result for SHA-256 7357bcdf5e65a677…

MALICIOUS

PDF

53.0 KB Created: 2020-05-24 10:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1685efdc6cc064d917be7b80a4bb03 SHA-1: 9e79d732513971dc0bd59090e666990cc3d53911 SHA-256: 7357bcdf5e65a677db6608dcb0f9aa7852c0af6bca6297eb68f00f942167314b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing indicating a large number of external PDF links, suggesting a link farm or a distribution mechanism for malicious content. The embedded URLs point to various domains, many of which appear to be dynamically generated or part of a coordinated effort. While no scripts were explicitly extracted, the PDF structure and the sheer volume of external links strongly suggest an attempt to redirect users to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://685cm.slpny.com/uploads/1/3/0/6/130605421/130605421.html#gramatica+en+ingles+corrector
    • http://ravisatyakahn.com/uploads/1/3/1/3/131383928/3c2aa83.pdf
    • http://closemyledger.com/uploads/1/3/1/4/131453927/852b2.pdf
    • http://9f62dcb100.com/uploads/1/3/0/5/130539325/jabuvagibedasak.pdf
    • http://jacobtaylor.info/uploads/1/3/0/8/130874127/7239901.pdf
    • http://r-ssolutions.com/uploads/1/3/0/9/130969910/5466151.pdf
    • http://tomzachwieja.com/uploads/1/3/0/6/130620202/voxaxak.pdf
    • http://marchenoir.ch/uploads/1/3/1/4/131410234/66b84509cdcdb6d.pdf
    • http://azhomeenergyaudits.com/uploads/1/3/0/8/130814630/murejowosox.pdf
    • http://acupofjoy.info/uploads/1/3/1/4/131483148/d98f403dab.pdf
    • http://anartistandco.com/uploads/1/3/0/7/130740401/datarofakekubexak.pdf
    • http://paginmodularusa.com/uploads/1/3/0/6/130604222/narisimu.pdf
    • http://mademoisellepublishing.com/uploads/1/3/0/2/130291658/7b9d3360f33ffc9.pdf
    • http://processserverdaily.com/uploads/1/3/0/3/130312968/tuboronarano.pdf
    • http://andylissak.com/uploads/1/3/0/7/130738789/sesikirewoke.pdf
    • http://chiangmaiawards.com/uploads/1/3/0/6/130621462/jutejipezam_kovopelowiroza.pdf
    • http://integrityconcreteconstruction.com/uploads/1/3/1/4/131407112/2366725.pdf
    • http://xcheckwegotyoucovered.com/uploads/1/3/0/5/130540159/ruzadonuvitam.pdf
    • http://madebymummy.net/uploads/1/3/1/3/131397964/6394076.pdf
    • http://olnaturalhealth.ca/uploads/1/3/0/5/130543467/xolozapi_gavav.pdf
    • http://numbersbeathunger.org/uploads/1/3/0/2/130289254/058e8f559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bfc.bin
245ab4bf01f66cd994b1eb49637b3cafff0af9c1c70d6f798f781ec020c7701a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFC 14360 bytes

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