Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a01fe3f237862c…

MALICIOUS

PDF

39.2 KB Created: 2020-03-14 20:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5fd7efc230d554ccf4c15814a660d02 SHA-1: 67d48b733ad6b55825290e1ed34ca1d3cb1e6e46 SHA-256: 76a01fe3f237862c88dfef08b9f3424896edbee06d575125dc5ad4f05ecfa4ee
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many of which appear to be generated for SEO purposes, hosted on various domains. The primary purpose seems to be link farming or redirecting users to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. No scripts were extracted, limiting the analysis of direct malicious actions.

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://youshimehaozhuanqiandewangluoyouxi.br3h.com/uploads/1/3/0/2/130271195/130271195.html#aneurisma+intrakranial+adalah+pdf
    • http://mta-sts.mail.unitystudioarts.com/uploads/1/3/0/3/130323571/dubutagasepokajoxomi.pdf
    • http://mail.aplusimmigration.com/uploads/1/3/0/6/130604606/rotozanugopetus-nidokon-dezila-fizabojut.pdf
    • http://www.hkareemllc.com/uploads/1/3/0/8/130874565/d553183e6b9aa.pdf
    • http://www.snoepzak.be/uploads/1/3/0/8/130814216/0e1661f1c09bc.pdf
    • http://divineemergence.com.au/uploads/1/3/0/3/130313284/pepideriragalarof.pdf
    • http://www.rbbalm.com/uploads/1/3/0/7/130739056/ropinetilofifitowozi.pdf
    • http://centuryhospitalitygroup.com/uploads/1/3/0/3/130324004/sawozenaf_wukuka_retavodu.pdf
    • http://perrydisetumblers.com/uploads/1/3/0/8/130874430/sowuminonivog-lixodedudawape.pdf
    • http://travelexa.net/uploads/1/3/0/9/130969529/tumuguxujeripusilas.pdf
    • http://nataliemangalindandesign.com/uploads/1/3/0/3/130323214/4614018.pdf
    • http://wabashtees.com/uploads/1/3/0/5/130588497/180a59.pdf
    • http://mindmeltgames.com/uploads/1/3/0/6/130621411/tavebokutunezo-zitiraritebab-waluvokozam.pdf
    • http://is-tbc.info/uploads/1/3/0/7/130739146/fe19d31d25975.pdf
    • http://californiahydrogenwater.com/uploads/1/3/0/4/130476150/5598555.pdf
    • http://intrinsiclifesciences.us/uploads/1/3/0/5/130590273/biralalij.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_off0000741d.bin
11c9e4a7abf1e3a8ded005e9c118528c09887a92dec91bb50db61d598846676b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 6896 bytes

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