Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af0704368c56641…

MALICIOUS

PDF

46.8 KB Created: 2020-03-24 08:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f024868dcdf333a37be4b33d4e84b64 SHA-1: 2379c9605dbb42d0a70b98d00a091417d3744611 SHA-256: 8af0704368c5664143ee05cd43c737955333f0f2d8090a4264e185ae3fcec395
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains a large number of external links pointing to PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The document body, though partially corrupted, contains references to these external URLs.

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://thefluencyfasteducationagency.com/uploads/1/3/0/7/130739686/130739686.html#reparto+proporcional+de+fracciones
    • http://noroom4weakness.com/uploads/1/3/0/5/130551015/rawurefekosomeb_gapetivaludedom_zifexakozuto.pdf
    • http://www.galeriazia.us/uploads/1/3/0/4/130435706/c09b09455.pdf
    • http://pellipandiri.com/uploads/1/3/0/4/130483187/8803729.pdf
    • http://frankencottage.com/uploads/1/3/0/6/130621554/tulidelevup.pdf
    • http://wiirgh.com/uploads/1/3/0/4/130436299/59b3f286f.pdf
    • http://elitestemmedia.com/uploads/1/3/0/6/130621808/069b6788.pdf
    • http://www.lorettascena.com/uploads/1/3/0/6/130604996/dedaduketotazotozu.pdf
    • http://tanjalatimer.com/uploads/1/3/0/9/130969522/7621854.pdf
    • http://millerfamilylawn.com/uploads/1/3/0/6/130605204/mevetosamijuli_xefaxaluk_xukaxapub_rikotuk.pdf
    • http://pokeylizardcreations.ca/uploads/1/3/0/3/130313169/wesokowup_jumezajivole_zemop.pdf
    • http://chunkeymonkey40.com/uploads/1/3/0/4/130489527/pavetuvofiz.pdf
    • http://slayerwasp.com/uploads/1/3/0/7/130776520/4034546.pdf
    • http://wellnessclub.blog/uploads/1/3/0/2/130289365/7295961.pdf
    • http://mta-sts.mail.jokekronenburg.nl/uploads/1/3/0/9/130969621/8109072.pdf
    • http://www.albunuelas.eu/uploads/1/3/0/4/130436197/438060.pdf
    • http://transgenderporno.com/uploads/1/3/0/7/130775982/6ea0ef4ea512c.pdf
    • http://yogamamacb.com/uploads/1/3/0/2/130271132/4157287.pdf
    • http://eatnutrigrub.com/uploads/1/3/0/8/130874001/dezimumerudulu.pdf
    • http://moneytalkwithtiff.com/uploads/1/3/0/6/130639114/getelesovavuge.pdf
    • http://littleoakdoula.com/uploads/1/3/0/2/130291592/2547671.pdf
    • http://warthogmarinellc.com/uploads/1/3/0/5/130539583/4742d9.pdf
    • http://cprstars.org/uploads/1/3/0/5/130551700/9081829.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007775.bin
6452c2da34a4647e0a5cdf8803432befe74447fb25578c45792748dc71d45e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 7284 bytes
font_01_sfnt_off000089fd.bin
90c3be7ab4db6f1cca06f1faa4e785d02a0055107c7639490f6c8a7b51be505a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FD 9064 bytes

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