Malicious PDF — malware analysis report

Static analysis result for SHA-256 502812d7f51cac42…

MALICIOUS

PDF

43.8 KB Created: 2020-03-22 04:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f510272af5567ee90d17aa70537cb4fe SHA-1: 44d7268ade0ca3ba968105a481ea6fa375e87887 SHA-256: 502812d7f51cac42dc2de55a3d15eee5533eb729ed450cca58aaa2794dc336f2
94 Risk Score

Malware Insights

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

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. No scripts were extracted, and the document body is largely unreadable, but the presence of numerous external links is a strong indicator of malicious intent.

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://garysstorage.com/uploads/1/3/0/7/130739416/130739416.html#clasificacion+de+los+organigramas+y+ejemplos
    • http://mta-sts.victoriacookson.com/uploads/1/3/0/5/130539992/1962513.pdf
    • http://claybytracy.com/uploads/1/3/0/8/130814581/josugotabibabi.pdf
    • http://lakegenevapsychologist.com/uploads/1/3/0/2/130272506/8c5f000fec5.pdf
    • http://kkmediation.com/uploads/1/3/0/2/130289426/d8274a222094e9.pdf
    • http://www.oceaninitiative.org/uploads/1/3/1/1/131163616/14e60f79.pdf
    • http://freistonassociates.com/uploads/1/3/0/6/130640028/bixiloxakodef-nudisopinikof.pdf
    • http://hodline.news/uploads/1/3/0/3/130312929/jerenu.pdf
    • http://actorsneeded.org/uploads/1/3/0/5/130590383/vezedafixiziv.pdf
    • http://kirby-sens.com/uploads/1/3/0/7/130740568/4992f5931f0a8.pdf
    • http://liz-donnelly.co/uploads/1/3/0/6/130621128/nawofalive.pdf
    • http://rvpal.net/uploads/1/3/0/6/130621640/nuvupiw.pdf
    • http://beltwaycoc.com/uploads/1/3/0/4/130436204/8c2df3f10d0d07.pdf
    • http://developmentalhealth.org/uploads/1/3/0/7/130740616/wezanameb.pdf
    • http://gracebetweenthepages.com/uploads/1/3/0/4/130436172/1531436.pdf
    • http://mindfulmerchandise.org/uploads/1/3/0/5/130550741/5104301.pdf
    • http://taoshiatsuvancouver.com/uploads/1/3/0/2/130272976/vanutaf.pdf
    • http://smalltownbigteaching.com/uploads/1/3/0/4/130475965/xoxujuzunow.pdf
    • http://franchisewav.com/uploads/1/3/0/4/130494289/kogufurotebime_miteke_tatasibim.pdf
    • http://rehphotography.org/uploads/1/3/0/7/130740205/kolabes.pdf
    • http://mx.tommypower.com/uploads/1/3/0/7/130738875/mupasapexa-zoman.pdf
    • http://www.absolutedoulacare.com/uploads/1/3/0/8/130814176/nefagadenivod_majit_nuwuwu.pdf
    • http://adkvision.org/uploads/1/3/0/5/130588802/7955186.pdf
    • http://cpsplantscapes.com/uploads/1/3/0/3/130379651/benolepimeme.pdf
    • http://www.artsandmovement.com/uploads/1/3/0/4/130476346/8708614.pdf
    • http://servicorreos.com/uploads/1/3/0/6/130620666/9991536.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_off00008152.bin
9cb8b7d48318a38e7f234485252314dd4bd37ad6a20369cc2bcc6e68a6093b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8152 8180 bytes

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