Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccc5b761b914a98…

MALICIOUS

PDF

53.0 KB Created: 2020-04-06 10:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 322d2e175fb03a6af4f45b680a5f26fa SHA-1: 30933d28f46c8777e0ff30f36f4ae0cd60ada90c SHA-256: cccc5b761b914a980b1343c36a0914fae8ffc51b65b8bdda4e708d357cdfba2c
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 to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links suggests the document's primary purpose is to redirect users to potentially harmful content or to artificially inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jlresidential.net/uploads/1/3/0/8/130813644/130813644.html#fracciones+ejercicios+2+eso
    • http://francine-henderson.com/uploads/1/3/0/2/130289551/nofikebez-wemufeg-mosoxut-kudafetasuxijun.pdf
    • http://beatsbylonewolf.com/uploads/1/3/0/6/130620475/vuvafebegotarik.pdf
    • http://djmistywilson.com/uploads/1/3/1/3/131383586/5909444.pdf
    • http://osakajapanesetx.com/uploads/1/3/0/6/130639593/tudufujodabak-togumimisij-gepapisilezida.pdf
    • http://fireflytrail.org/uploads/1/3/0/9/130969817/zedezunizizafiwato.pdf
    • http://inspiremylove.com/uploads/1/3/1/0/131070572/6386923.pdf
    • http://pandie.org/uploads/1/3/0/5/130590363/f548414a.pdf
    • http://zynall.com/uploads/1/3/0/3/130312919/37b623da6ae99.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007415.bin
bd1f812c4770a60c5f78092af1c424c377a7d130d89bd3886052fcf75125540f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7415 9904 bytes
font_01_sfnt_off0000973f.bin
f43f25c1d9f692ce005981edfa919bdfa16c1eb6060be78dbcc15556fc70e3c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x973F 4320 bytes
font_02_sfnt_off0000a502.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA502 2652 bytes
font_03_sfnt_off0000ae6b.bin
2140a621cbe41a344d402aa1ace52413eb91f420724312bb2ba6c9d8c9d49267		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 16344 bytes

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