Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbab110aebb09d81…

MALICIOUS

PDF

38.5 KB Created: 2020-03-31 03:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3482b3a2e312a20ca849c33a48428bfd SHA-1: cb98069cc8ed6064e3ba0196473f0e82bc342e3b SHA-256: bbab110aebb09d8117ff407ab602806e9f4fd5e8c5ad9879da781f59cba7fe47
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding a large number of external URLs. The heuristic PDF_SEO_LINK_FARM firing indicates a deliberate attempt to create a mass of links, likely for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains what appears to be search query text and metadata, further supporting the link farm hypothesis.

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://fundraisers-aylsham.com/uploads/1/3/1/3/131379116/131379116.html#kenmore+he2+dryer+code+f-26
    • http://piecesoftimewest.com/uploads/1/3/0/6/130604549/37141.pdf
    • http://juan100.online/uploads/1/3/0/2/130271043/seretitojulimofumew.pdf
    • http://destinyhendricksart.com/uploads/1/3/1/4/131437728/6496057.pdf
    • http://stephaniejacobs-sculptures.com/uploads/1/3/1/1/131164507/ffb63afbcc0.pdf
    • http://vestedventuresinc.com/uploads/1/3/0/5/130551257/620b7f4ba56855a.pdf
    • http://gsfx.org/uploads/1/3/0/6/130604030/9684942.pdf
    • http://jengrahamhairdesign.com/uploads/1/3/0/3/130313271/zonupavulaga_nisin.pdf
    • http://klippress.net/uploads/1/3/0/6/130639770/dusuxuke.pdf
    • http://promotionsbyweb.net/uploads/1/3/1/4/131408772/fasekul.pdf
    • http://centralcoastsnakecatchers.com/uploads/1/3/0/9/130969768/zizeri.pdf
    • http://roselinepartners.com/uploads/1/3/0/2/130289779/xuxexulifolaf-kupekerusebu-rinerubi.pdf
    • http://hannastaxservice.com/uploads/1/3/0/4/130488470/zalijozef.pdf
    • http://naturallyherbals.net/uploads/1/3/0/5/130538981/4341bce0bda567a.pdf
    • http://attiliobencivenga.com/uploads/1/3/1/0/131070689/7220705.pdf
    • http://claritybarton.com/uploads/1/3/0/6/130604465/zejemowotoserewawovo.pdf
    • http://mtmotorboatin.com/uploads/1/3/0/6/130604812/058c82ad.pdf
    • http://neuroandepilepsycareinc.net/uploads/1/3/0/5/130538956/xisikemi_weropegiru.pdf
    • http://pjcitrus.net/uploads/1/3/0/5/130539357/518361.pdf
    • http://canisiusgallery.com/uploads/1/3/1/4/131409822/kuzurilipigumena.pdf
    • http://fashionmaven.life/uploads/1/3/0/5/130588875/e7ec40.pdf
    • http://tcsonline.net/uploads/1/3/1/3/131383407/xupirovozik-xapubaputugalid.pdf
    • http://awenindependentarts.com/uploads/1/3/1/3/131380265/pegetopereje-refojebewe-luwakaxukizupa.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_off0000702e.bin
3d9e84f0b9b5e01364ea46b99a2a2fb88696efe0b2167e74f70ac98f8833d4f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702E 7108 bytes

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