Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5416fd4fd9b00c…

MALICIOUS

PDF

39.6 KB Created: 2020-04-09 23:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12e242aad267fc6cb368e7c9543525e6 SHA-1: 74d6f06b7eec9cc789a2253c32e174e6f80cc554 SHA-256: 9b5416fd4fd9b00c5930cd40622664ff8696253170df36e526961ef1dc9dedb7
94 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 as a PDF_SEO_LINK_FARM heuristic. The primary URL points to a page with a title suggesting educational content, but the overall structure indicates a likely attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

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://trinitycoby.com/uploads/1/3/1/6/131636692/131636692.html#probl%C3%A8mes+ce2+multiplication+2+chiff
    • http://skymoor.com/uploads/1/3/1/0/131071125/kaxetugig-bigetosul-wemosupo.pdf
    • http://smokinburntends.com/uploads/1/3/0/8/130873791/fopajotadibo_tidufanu.pdf
    • http://setholsonspianoservice.com/uploads/1/3/0/5/130551611/ac27f19.pdf
    • http://jeremysalvatierra.com/uploads/1/3/0/6/130621413/f0334f19b7832.pdf
    • http://mayrteach.com/uploads/1/3/0/7/130776315/nexisofewo-fotijeves-wavujiguda-pibove.pdf
    • http://fraservalleyfreeschool.ca/uploads/1/3/1/3/131384156/natusu_zabiz_wekovuzaripovo_xoleriwuvider.pdf
    • http://nguyenvietcoffee.com/uploads/1/3/0/4/130489052/kodajikitujorebu.pdf
    • http://alexandervonswaine-preis.com/uploads/1/3/0/5/130543671/3056704.pdf
    • http://mikellstreasures.com/uploads/1/3/0/5/130590374/4125d6a02.pdf
    • http://pof-freeaddcalls.com/uploads/1/3/0/8/130813840/1ce953c0eb017b.pdf
    • http://theentangledminds.com/uploads/1/3/0/9/130969608/ce8ad5.pdf
    • http://stamfordplazaleasing.com/uploads/1/3/0/6/130639698/0ba657e.pdf
    • http://kitsap.dance/uploads/1/3/1/4/131453114/6714345.pdf
    • http://leosroofingmaintenancellc.com/uploads/1/3/0/9/130969887/lebovajanokixu.pdf
    • http://bestshoregroup.com/uploads/1/3/0/6/130604625/3711311.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_off00006d70.bin
89d4dbd68719ae56e822f0511262fa6fe281f05482bb4d8e1588cc3b3c59819a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D70 9624 bytes

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