Malicious PDF — malware analysis report

Static analysis result for SHA-256 571e5815f8606e8a…

MALICIOUS

PDF

47.9 KB Created: 2020-05-07 09:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c818515367336119186782f6062eafcc SHA-1: 8112d80fe3cedc73da77452d1d14d25998b28bf5 SHA-256: 571e5815f8606e8a491a56841370a36091a58e7e743fce3358efbc760fc38699
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs hosted on similar domains. The primary URL found in the document body, http://usad2a.com/uploads/1/3/1/4/131437867/131437867.html#distance+time+graphs+corbett+maths+answers, suggests a lure related to educational content. This pattern is indicative of SEO spam or a phishing campaign designed to drive traffic to potentially malicious sites.

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://usad2a.com/uploads/1/3/1/4/131437867/131437867.html#distance+time+graphs+corbett+maths+answers
    • http://courtneyfarmsllc.com/uploads/1/3/1/4/131453539/68cd7e.pdf
    • http://purrfectnakids.com/uploads/1/3/0/2/130289611/pepixekawujomebok.pdf
    • http://mdemeranville.com/uploads/1/3/1/3/131379678/wavikisusuladid.pdf
    • http://jemporiumvintage.com/uploads/1/3/1/3/131383733/jugegatop.pdf
    • http://brandmeasures.com/uploads/1/3/0/3/130379058/mirekiw_jifibinolo_mojoki.pdf
    • http://e15fuel.org/uploads/1/3/1/3/131380569/lojosotab.pdf
    • http://ctmsolns.net/uploads/1/3/0/4/130483507/3052205.pdf
    • http://mibbler.com/uploads/1/3/0/5/130588894/8477579.pdf
    • http://wghgroupllc.com/uploads/1/3/0/4/130488252/4438492.pdf
    • http://hashtagpositivity.academy/uploads/1/3/0/6/130640057/larativirad-dagej-vudejosejumiwav-xezejig.pdf
    • http://gondaragency.com/uploads/1/3/0/6/130604447/jovamej_vovajoge_furakaju.pdf
    • http://gayaenterpriz.com/uploads/1/3/0/3/130323324/musugenuwu-selamomoziwexul-nemapibize-fevotob.pdf
    • http://theyogaden.net/uploads/1/3/0/8/130874030/36aa777a6.pdf
    • http://copperrose.net/uploads/1/3/1/4/131438775/7539722.pdf
    • http://kundaliinijoogakoulu.com/uploads/1/3/0/2/130289225/vigininezafisi.pdf
    • http://longlastingautodetail.com/uploads/1/3/0/7/130776324/9918307.pdf
    • http://corporate-communication-solutions.com/uploads/1/3/1/4/131453595/2960813.pdf
    • http://geekwheel.com/uploads/1/3/1/1/131164180/rikakim.pdf
    • http://mohamedaly.club/uploads/1/3/0/2/130291593/dozalufefisak.pdf
    • http://courtneyfarmsl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off000090e6.bin
c1a62cf8cd4fa25ba0992dc1f867757beaf0a1b5100afb71e2e562d8ce1f5930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E6 10532 bytes

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