Malicious PDF — malware analysis report

Static analysis result for SHA-256 18282b33f85a25b6…

MALICIOUS

PDF

58.9 KB Created: 2020-03-27 01:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8be6a8ff814385e5fb66c01eb071767 SHA-1: 2ab9ea1fa40fed94439f4780e3cded2f7a3cf752 SHA-256: 18282b33f85a25b67678d4601215ced018680079c6ce4aac11760236fd247c17
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the presence of 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://sustainablefleet.com/uploads/1/3/0/8/130813798/130813798.html#literatura+salvadore%C3%B1a+de+la+primera+mitad+del+siglo+20+caracteristicas
    • http://ontimemedicaldevices.com/uploads/1/3/0/6/130603943/388204.pdf
    • http://scottpowers.net/uploads/1/3/0/6/130621264/vafulagez.pdf
    • http://azalearidgehoa.org/uploads/1/3/0/5/130551907/vuxogizazupivevikaba.pdf
    • http://blocktekcapital.com/uploads/1/3/0/5/130588377/virotobigasozusav.pdf
    • http://kukuromance.com/uploads/1/3/0/5/130588721/0aabff4bc2.pdf
    • http://therapeutichealthcompany.org/uploads/1/3/0/7/130775436/ba090.pdf
    • http://zebbybelts.com/uploads/1/3/0/9/130969562/a1ae4acbc867e.pdf
    • http://mirrorimagedanceteam.com/uploads/1/3/0/5/130590474/kojojukolex-pexamal-segotiwupuv.pdf
    • http://mytraveltracker.app/uploads/1/3/0/7/130739910/fibudifebepe-birotezorif.pdf
    • http://trialmadeeasy.com/uploads/1/3/0/4/130489830/gujaj.pdf
    • http://merelymelissa.com/uploads/1/3/0/6/130603961/fumor-vozanani-dikabejigu.pdf
    • http://alloutdoorsjob.com/uploads/1/3/0/9/130969304/tejuzoxa.pdf
    • http://filjun.com/uploads/1/3/0/5/130551697/8741718.pdf
    • http://cremecilla.com/uploads/1/3/0/5/130590435/96460.pdf
    • http://dallasstaffingsolutions.com/uploads/1/3/0/6/130620887/lulubap.pdf
    • http://natalie.tolighting.com/uploads/1/3/1/0/131070289/malexozujiwobu.pdf
    • http://nashvillerollingpincompany.com/uploads/1/3/0/6/130620614/156c66c1fb9ce0d.pdf
    • http://www.grooveyourasana.com/uploads/1/3/0/7/130775728/6968159.pdf
    • http://meduvation.com/uploads/1/3/0/2/130273812/29bf3240ca6.pdf
    • http://tranqill.com/uploads/1/3/0/5/130541188/fukibigolaxo_vijolo_zufepakiwo.pdf
    • http://www.amurdc.com/uploads/1/3/0/7/130775104/waxuxupubosefes.pdf
    • http://inletmarketing.com/uploads/1/3/0/8/130813489/jolupudifarula_dubiguxa.pdf
    • http://eco-revolution.net/uploads/1/3/0/6/130620265/lazepifok_jibajedi.pdf
    • http://douglasmcferran.com/uploads/1/3/0/6/130639862/pogusedanipufep.pdf
    • http://danielthedunbar.com/uploads/1/3/0/6/130639408/8588560.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_off0000b761.bin
0fd998baab656eda8eae209447ea10c0b06029daefdd1203b9a0f32a9ec3d27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB761 9744 bytes

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