Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7be0e4e89818b0…

MALICIOUS

PDF

39.5 KB Created: 2020-04-03 03:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c93ebce6abeac00b2d2a508fd36b023e SHA-1: 706968d3f05a314c7b2c359ae20db90bf3eaad44 SHA-256: 5d7be0e4e89818b00c96ba21fbe2af747a9b14105b4b77a6f8184049c5c4d28c
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting it is part of a link farm designed to drive traffic to various websites. The document body, though partially corrupted, indicates a lure related to 'Formato bordes y sombreado word 2013' (Word 2013 borders and shading format). The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a deceptive link-sharing scheme.

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://iammysk.com/uploads/1/3/0/7/130738641/130738641.html#formato+bordes+y+sombreado+word+2013
    • http://swtransportationservices.com/uploads/1/3/0/5/130551342/wubifakupene.pdf
    • http://rosecityelite.com/uploads/1/3/0/4/130476703/kofexedodavapo-tunerejup-nafolozok-fekafuk.pdf
    • http://montgomerycountynewyearseve.com/uploads/1/3/0/9/130969935/fituvujumigomita.pdf
    • http://ayvarosecosmetics.com/uploads/1/3/0/6/130621134/4634603.pdf
    • http://lolaslanding.ca/uploads/1/3/0/5/130550936/wujik.pdf
    • http://hostmaster.fsa-ibs.de/uploads/1/3/1/4/131452845/5286765.pdf
    • http://sidespin.de/uploads/1/3/0/7/130776677/fedudufurebi.pdf
    • http://rydepropertymaintenance.com/uploads/1/3/0/4/130435753/jegofitijanazasi.pdf
    • http://ismartcommunications.com/uploads/1/3/0/5/130589145/pumikopimita.pdf
    • http://randrbylinda.com/uploads/1/3/0/3/130313263/budeduwipexim.pdf
    • http://limostlouis.org/uploads/1/3/0/7/130740086/6659507.pdf
    • http://mercedesudaeta.com/uploads/1/3/0/7/130775831/4b486c7967dab77.pdf
    • http://chroniccuresht.com/uploads/1/3/0/6/130604511/b94fde8a6bc.pdf
    • http://annettelscott.com/uploads/1/3/0/2/130289172/lidivofodazeda.pdf
    • http://sochilllimo.com/uploads/1/3/0/6/130604304/nufitifatuvefamexu.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_off00006fa2.bin
e7f5453c970c0dd98b3c5c995892979d62a752d02b70560bb8e48a76c543bdab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA2 8544 bytes

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