Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e7fedc0d2de876…

MALICIOUS

PDF

43.8 KB Created: 2020-03-30 10:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 99ed8ef2dcee1a131b0a16fce92efab3 SHA-1: c83ec86b2ea496fc8b709e10688f4ca844a5468b SHA-256: 73e7fedc0d2de876f3ef240647d227f075fc1a1df186e654534b81dd9bdab2ae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains a product name and URLs that are likely part of a lure to encourage clicks. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for containing numerous external links.

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://advance-it.net/uploads/1/3/0/5/130551153/130551153.html#kidkraft+metropolis+train+set+with+roll-up+felt+play+mat
    • http://lindseyparkernovak.com/uploads/1/3/0/7/130739131/5aeca6bd51.pdf
    • http://barnyardbunch4hclub.org/uploads/1/3/0/6/130604768/rawijib.pdf
    • http://martinapook.com/uploads/1/3/0/6/130639972/xidiruso-wesilutagiri-wopitajat.pdf
    • http://bravocharlie.pl/uploads/1/3/0/8/130874482/446912.pdf
    • http://nothingbutpurpose.com/uploads/1/3/0/6/130621715/dofaro.pdf
    • http://lastfrontiermusic.com/uploads/1/3/0/6/130604918/pazatagovigi.pdf
    • http://ownitdm.com/uploads/1/3/0/5/130590391/fisad_bejuronori.pdf
    • http://becomingamasterbuilder.com/uploads/1/3/1/4/131406455/sonud.pdf
    • http://rachellarmar.com/uploads/1/3/1/4/131406361/ximudilavazofewi.pdf
    • http://existential-crisis.com/uploads/1/3/0/4/130483346/zigunixad.pdf
    • http://lgbelectricalcontractinginc.com/uploads/1/3/0/6/130639876/bimidufex.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_off00007e96.bin
4a4def05f45fcf1cb34482aa915fac80f7b5a773eaf69a6d745b1a2c02e5f6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E96 8764 bytes

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