Malicious PDF — malware analysis report

Static analysis result for SHA-256 213e51df73eb8b5a…

MALICIOUS

PDF

39.5 KB Created: 2020-04-02 12:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e9a51839222d5ecd04dc0a4806f6b305 SHA-1: 05f133d328546a22c480f8a2af3c451d811de9e6 SHA-256: 213e51df73eb8b5ae7ea4eab451cd664e469ae9b41307c01e958301c12ec2992
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also strongly indicated maliciousness. The document body text, though partially obfuscated, contains a reference to 'Indian rivers and dams map pdf' and the wkhtmltopdf application, suggesting a lure for potentially unrelated content. The primary attack pattern appears to be SEO poisoning or a link farm designed to redirect users to potentially malicious or unwanted content hosted externally.

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://weatherproofguide.com/uploads/1/3/0/6/130604447/130604447.html#indian+rivers+and+dams+map+pdf
    • http://bigislandeventrentals.com/uploads/1/3/0/5/130588942/6470724.pdf
    • http://mamamiabeautyclinic.com/uploads/1/3/1/4/131406892/gulud.pdf
    • http://motonorm.com/uploads/1/3/0/5/130551190/5171393.pdf
    • http://ka-bloomgroup.com/uploads/1/3/0/2/130287738/5106867.pdf
    • http://stokesmetaldesign.com/uploads/1/3/0/9/130969678/5455875.pdf
    • http://frankydoyle.com/uploads/1/3/0/2/130288532/rasosaxupuj-fikubiruxijalus.pdf
    • http://robertpirsig.net/uploads/1/3/0/2/130270799/wozakazezedekoj.pdf
    • http://extremeexcavations.com/uploads/1/3/1/3/131380993/fd7ccb2d82083.pdf
    • http://rjsdiner.org/uploads/1/3/1/3/131379324/2723135.pdf
    • http://essemmevents.net/uploads/1/3/0/7/130774993/7783503.pdf
    • http://libertywin88.com/uploads/1/3/1/3/131383377/4124760.pdf
    • http://finaldfinanziamenti.com/uploads/1/3/0/5/130590325/xogenofudeduwem_dopipikemakowe.pdf
    • http://lowtoasthockey.com/uploads/1/3/0/5/130551219/4443611.pdf
    • http://bernardobellostudio.com/uploads/1/3/0/4/130483869/3284089.pdf
    • http://commons-middletown.com/uploads/1/3/0/6/130620665/105b1309205200.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_off0000711f.bin
75ee0b7d9225fa3aafd5c7e9928e59d2fe0ff842f1a2fa505aed6c727f40d1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 8196 bytes

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