Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b098eaa00c12c31…

MALICIOUS

PDF

36.8 KB Created: 2020-04-30 00:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ace3a146c08fd63d8b3668738d25294b SHA-1: 6ceae854be9b1008e4f342cb61620b7c9924df1c SHA-256: 5b098eaa00c12c31b3f38a70fa0c0679eac4cf14bbdcb5a2306696b1dc033801
104 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, indicated by the presence of a 'download button' heuristic and a large number of embedded external links, many of which point to PDF files with numeric slugs. The ML classifier strongly flagged this sample as malicious. The primary URL, http://drobgyn.net/uploads/1/3/0/5/130588342/130588342.html#techno+gamer+gta+5+android+90mb, suggests a lure for game-related downloads, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drobgyn.net/uploads/1/3/0/5/130588342/130588342.html#techno+gamer+gta+5+android+90mb
    • http://novarealtyservices.com/uploads/1/3/0/8/130813055/9295459.pdf
    • http://swiftairporttransportation.com/uploads/1/3/1/0/131070911/malajal_bojajavewef_jigip_vazixetom.pdf
    • http://eglom.org/uploads/1/3/0/5/130588607/jotatap-novotutavazilix-povidefela-dipitote.pdf
    • http://tropicalautosales.net/uploads/1/3/0/2/130288926/jikofagabijogu.pdf
    • http://crossfitbluepride.org/uploads/1/3/0/3/130379082/mowaxexuta.pdf
    • http://exploregodsworld.net/uploads/1/3/0/5/130590467/d8ff9329c4b.pdf
    • http://piercecleaningservices.com/uploads/1/3/0/4/130476496/2445355.pdf
    • http://queenofheavenllc.com/uploads/1/3/1/3/131379548/17417d0dab31ff.pdf
    • http://southsideskating.com/uploads/1/3/1/4/131438667/menigejaxofebujajov.pdf
    • http://pinkslayergifts.com/uploads/1/3/0/7/130776578/gulamuxexadafupe.pdf
    • http://debsherkhumanistofficiant.com/uploads/1/3/1/3/131384145/aa3faf9f938.pdf
    • http://donbronzatti.com/uploads/1/3/0/9/130969663/1b5ab.pdf
    • http://pennies4thepoor.com/uploads/1/3/0/8/130814235/fabofujupi.pdf
    • http://serunion.co/uploads/1/3/0/7/130740429/mozinilujodapof.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_off000064f8.bin
6ac6852e2b591aa0ed1cfc9a89f7b4598fd8e0a7a8e0e9ac77bc9de8d67c527a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 8460 bytes

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