Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8989b094f2e752…

MALICIOUS

PDF

40.9 KB Created: 2020-03-17 07:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1607619f42092915ec9502ba7afb2014 SHA-1: 0abd3e7fe55df840a6ff266d102717adbae545c2 SHA-256: 7b8989b094f2e752c0cae637a3da22a055048f8b18dd2f2ed5653ab1ef1c4e4c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains URLs that are also listed in the extracted URLs. The primary function appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

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://acouturelife.com/uploads/1/3/0/8/130874076/130874076.html#criminologia+clinica+pdf+manzanera
    • http://bearfruitsbaskets.com/uploads/1/3/0/4/130435960/5696054.pdf
    • http://www.rustruth.com/uploads/1/3/0/7/130775837/ec4c93c4.pdf
    • http://jfelectricltd.com/uploads/1/3/0/6/130604067/sivobozebobozob.pdf
    • http://jayexner.com/uploads/1/3/0/3/130313192/8955244.pdf
    • http://edinalandscaperpros.com/uploads/1/3/0/9/130970003/sebuf-mijun.pdf
    • http://sobersettings.com/uploads/1/3/0/7/130775528/3ec21fbf8d.pdf
    • http://mquest.space/uploads/1/3/0/6/130621484/1003992.pdf
    • http://mta-sts.asitileandstone.com/uploads/1/3/0/9/130969045/budixi.pdf
    • http://www.robinsoninternational.org/uploads/1/3/0/7/130740086/de1f7.pdf
    • http://salsipuedesstreetmovie.com/uploads/1/3/0/4/130483561/4cca068aa.pdf
    • http://hpvetsclubheritagepines.net/uploads/1/3/0/6/130604801/wakalixubezapusa.pdf
    • http://www.diegoocchi.com/uploads/1/3/0/5/130590308/nevonij-valev-rarimowepafuk-vigigofebixegeg.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_off000074f0.bin
4a7d363c37994a4cc54e52d8a4bdfa2f27fec048b1908c9a37947c52fdb2216d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 9012 bytes

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