Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1dbb6fc7309243…

MALICIOUS

PDF

57.3 KB Created: 2020-05-03 18:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4ebd0e3b2d67dad1e0d6d3ac79d8ec1 SHA-1: 1fcd487706ebbd3f75b3d182e536d99bc22d493a SHA-256: 0c1dbb6fc73092439d743594c4d13f6a03a59bd1ff98d6541abd6e58437710f6
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to PDF files on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the primary purpose is to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://picjosh.com/uploads/1/3/0/2/130288391/130288391.html#osrs+99+crafting+guide+with+profit
    • http://test-website-version.com/uploads/1/3/0/6/130639215/wasunazuririr.pdf
    • http://savvysexystyle.com/uploads/1/3/0/4/130436207/zegatusewi.pdf
    • http://ygnaciocenter123.com/uploads/1/3/0/5/130589103/nisedukom_meviviwu_bozotewas.pdf
    • http://kaptive8moto.com/uploads/1/3/0/4/130477541/5787278.pdf
    • http://kurisuto.com/uploads/1/3/0/7/130740235/3d53214.pdf
    • http://twofatolives.com/uploads/1/3/1/3/131398220/2531185.pdf
    • http://morrisoncohentherapy.com/uploads/1/3/1/4/131453230/giduk.pdf
    • http://ulcergardforhorses.com/uploads/1/3/0/2/130289519/zevod-xifosadezeli.pdf
    • http://emoby.info/uploads/1/3/1/8/131856959/5401864.pdf
    • http://bikramyogaredmondoregon.com/uploads/1/3/0/7/130739303/0ae1ae001693.pdf
    • http://matthewsdentalut.net/uploads/1/3/1/3/131380707/bixebajefutifu-gusenisixu-kumazaguvur.pdf
    • http://farmhousedesignsnj.com/uploads/1/3/1/4/131438091/5261261.pdf
    • http://kingofthecasinos.com/uploads/1/3/0/7/130775154/vanalonot.pdf
    • http://mitchellfamilychefs.com/uploads/1/3/1/8/131872104/6767613.pdf
    • http://elliehackney.com/uploads/1/3/0/5/130590596/349777c1a9e1d10.pdf
    • http://11thhourtravel.com/uploads/1/3/1/1/131163980/korisetir.pdf
    • http://ksqfarmersmarket.com/uploads/1/3/0/5/130547207/9a8cb4ec.pdf
    • http://keatingreunion.com/uploads/1/3/1/1/131163838/b93c43c34e3d.pdf
    • http://laloupe.studio/uploads/1/3/0/3/130323929/muzaxopevagutovo.pdf
    • http://westminstercotowing.com/uploads/1/3/1/4/131438018/928633.pdf
    • http://holleyeverafter.com/uploads/1/3/0/4/130483993/relori_vogibozatev_mipufu_gadegotux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b557.bin
bdc861849c35db2e1946e7e93494b7bd99a7b8aa0c70993e2b60ff2e97f91a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 10872 bytes

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