Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb366da7b6c2ddc…

MALICIOUS

PDF

54.5 KB Created: 2020-03-23 16:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d81ec5efb078593d5bd4a34725cb0868 SHA-1: a00105c88ceaa75f4ec043b9e67b1297ae845253 SHA-256: fcb366da7b6c2ddc4e2e1e23a87a0d262de2f5d1695c9242af64693aa48fd9c9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links to other PDF files hosted on various domains, 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 references to a book title and the wkhtmltopdf application, suggesting a potential lure or content stuffing technique. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content or for SEO manipulation.

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://bookmichellenunes.com/uploads/1/3/1/1/131164157/131164157.html#kevin+j+conner+interpreting+the+symbols+and+types+pdf
    • http://mindmapfraktl.com/uploads/1/3/0/6/130639629/vixesesega_zuvimomo.pdf
    • http://eclipseafterglow.com/uploads/1/3/0/3/130313271/6b4f786e89a6.pdf
    • http://hostmaster.vetwoundlibrary.com/uploads/1/3/0/5/130550948/ximafozigisas.pdf
    • http://pamdecorators.com/uploads/1/3/0/5/130543552/wosomejakikoz.pdf
    • http://badasscoinrings.com/uploads/1/3/0/4/130489228/4776634.pdf
    • http://o2skinrenu.com/uploads/1/3/0/6/130604314/8124186.pdf
    • http://tropicaloilandgas.com/uploads/1/3/0/3/130313179/futiladinimizuwu.pdf
    • http://tcsoutheastbaseball.com/uploads/1/3/0/7/130776026/kupixuwiwurit_gedororavu_pegixosoropesi_wobunab.pdf
    • http://911-podarok.site/uploads/1/3/0/6/130603887/somid.pdf
    • http://www.kathrin-walther.com/uploads/1/3/0/8/130813614/fujeradowapurotalo.pdf
    • http://cpanel.bonplan-pinel.com/uploads/1/3/0/5/130543453/vagoxabope_giloxan_vatezesuwamuti_zumadasobanajab.pdf
    • http://madlibsforkids.com/uploads/1/3/0/7/130739086/c259c4fb6ffe.pdf
    • http://www.wallmusiclessons.com/uploads/1/3/0/3/130313314/bbe91.pdf
    • http://cjfalconer.com/uploads/1/3/0/5/130538863/nabivaxar-nagazodigis.pdf
    • http://johngeneralconstruction.com/uploads/1/3/0/3/130379612/lasozep.pdf
    • http://www.preciouscoffer.com/uploads/1/3/0/7/130738841/5878496.pdf
    • http://thecommonclimber.com/uploads/1/3/0/6/130621353/4444286.pdf
    • http://dvvap.org/uploads/1/3/0/8/130874194/499e88a0.pdf
    • http://fresh-start.life/uploads/1/3/0/9/130969904/xefuju.pdf
    • http://skynet247.com/uploads/1/3/1/1/131164109/e1210f26c1a16.pdf
    • http://www.seacreaturesandwich.com/uploads/1/3/0/5/130550803/xegusuzomozoxowesupa.pdf
    • http://mymosaicalphabetbook.com/uploads/1/3/0/5/130546432/junigotowolagamowi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088c1.bin
9ef066d52cecd55b6a9921b8dc317c70c46e070d4a232e40b76fc2ed0ca1b524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C1 8240 bytes
font_01_sfnt_off0000a8a1.bin
3786621a70232dbedc177bbdff57111b150460433d7c5439a50018624ba61495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A1 3012 bytes
font_02_sfnt_off0000b32f.bin
0ada80b1c0b0ba4974decf30d1fd11d0123bb38d86c408b44782b5bf034400f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 16996 bytes

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