Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dd4d6063d70911…

MALICIOUS

PDF

58.3 KB Created: 2020-03-07 19:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b90a20d391e88179cb7637e57cac691 SHA-1: 406cbf7c69412cad7b5404f70d0d86b26cc8ca58 SHA-256: 44dd4d6063d70911f447aae2b229a9699181b209fbf74ad096f0bf0a7be261db
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The ML classifier strongly identified this sample as malicious. The primary attack pattern involves redirecting users through a network of SEO-optimized links, likely to host further malicious content or phishing pages. The presence of a large number of external links, many with numeric or slug-based filenames, suggests an attempt to manipulate search engine results or distribute malware through seemingly innocuous documents.

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://adsl-63-204-18-34.benefitplans.org/uploads/1/3/0/5/130539795/130539795.html#how+has+deforestation+contributed+to+climate+change+quizlet
    • http://cbseeds.net/uploads/1/3/0/7/130774979/gidajokonanugu.pdf
    • http://bellinghamlacrosse.com/uploads/1/3/0/5/130551073/154f19515.pdf
    • http://www.loyolamaryanddanceteam.com/uploads/1/3/0/6/130639629/rizabutupa.pdf
    • http://cassandrascateringandmeals.com/uploads/1/3/0/6/130620760/pixafezodota.pdf
    • http://aldodelgado.net/uploads/1/3/0/5/130540405/2bf8bec.pdf
    • http://www.oceanpoolsla.com/uploads/1/3/0/5/130550809/tezeta-xijigorodajoro.pdf
    • http://myartisfashion.com/uploads/1/3/0/6/130620759/sazewufabifixo.pdf
    • http://goyshop.site/uploads/1/3/0/7/130776590/noxigadedarirevenul.pdf
    • http://nantymoelprimary.com/uploads/1/3/0/5/130551129/8985924.pdf
    • http://broneirion.co.uk/uploads/1/3/0/4/130488669/zasifina.pdf
    • http://groovyemail.com/uploads/1/3/0/6/130639438/fuvug.pdf
    • http://dealsforyourtown.com/uploads/1/3/0/7/130776462/1989914.pdf
    • http://arbonnenz.com/uploads/1/3/0/6/130621312/2827320.pdf
    • http://www.gordonstounartandphotography.com/uploads/1/3/0/6/130603874/wefatubokanem_detulisisamipip_vuzomenilabavet_jibodexipuvifok.pdf
    • http://aulayaiqsimarugut.com/uploads/1/3/0/7/130739048/615d1aefd1c41.pdf
    • http://appiassociation.org/uploads/1/3/0/5/130588347/c8b7412.pdf
    • http://nodeberiacontarlo.com/uploads/1/3/0/6/130621457/6688336.pdf
    • http://mta-sts.secondaryschool.ms/uploads/1/3/0/4/130476597/belije.pdf
    • http://www.happycatplace.com/uploads/1/3/0/6/130621044/8751566.pdf
    • http://naturopathsinternational.org/uploads/1/3/0/2/130288729/vujegogupivamigidap.pdf
    • http://clubheros.org/uploads/1/3/0/5/130590666/fezosi_kutawiku_bupujexet.pdf
    • http://skyconnectglobal.com/uploads/1/3/0/2/130289789/xobobufakumukuvonot.pdf
    • http://privacyprerogative.com/uploads/1/3/0/7/130775434/68e31c087a743ed.pdf
    • http://lindsaystyler.com/uploads/1/3/0/7/130739601/3559626.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_off0000b6a3.bin
a9eb32afe3106b099cd94667e8da5b430df3add964f0e847218d4ccc2c534563		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 9388 bytes

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