Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10dc7302488b148…

MALICIOUS

PDF

39.7 KB Created: 2020-03-29 01:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 295a043367a04913f5782d44d664aa55 SHA-1: b3975616fa80e628ab2aa71dbf7052c1a07a6be9 SHA-256: f10dc7302488b148cd29a4163ffae3976d17c31dbe89b14819b0fce194abad42
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text, while partially corrupted, includes a URL that is also present in the heuristics, suggesting a deliberate attempt to direct users to external resources. The primary attack pattern appears to be SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites.

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://michaelshusko.com/uploads/1/3/1/3/131382430/131382430.html#cuantos+y+cuales+son+los+libros+del+antiguo+testamento+y+nuevo+testamento
    • http://kn.eliteedu.org/uploads/1/3/0/5/130544547/roxoropito.pdf
    • http://curiousgigi.com/uploads/1/3/0/7/130739603/7504654.pdf
    • http://monstacartoons.com/uploads/1/3/0/3/130323703/gozob.pdf
    • http://skepticbrain.com/uploads/1/3/0/5/130589114/tukalado-radatabazotepu-ribadavefa-zavixa.pdf
    • http://fragarealestate.com/uploads/1/3/0/2/130273803/7383707.pdf
    • http://automateforgood.com/uploads/1/3/0/4/130476273/48a4849e7.pdf
    • http://betterbasicsco.com/uploads/1/3/1/1/131163949/burixikuj.pdf
    • http://tomaswong.com/uploads/1/3/0/5/130588499/7498290.pdf
    • http://www.americanmartyrsfamiliesinfaith.com/uploads/1/3/0/5/130539165/9714278.pdf
    • http://sheslaywigs.com/uploads/1/3/0/2/130289305/vizuj-jixib.pdf
    • http://weather-change.com/uploads/1/3/0/5/130588513/8152429.pdf
    • http://ultralightbabes.com/uploads/1/3/0/4/130489499/93bd3e4950.pdf
    • http://theprocessonline.org/uploads/1/3/0/7/130739505/8450669.pdf
    • http://maparadis.com/uploads/1/3/0/7/130775603/tejawojeluvi-samemoziju-kevopoxezefoz.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_off00006f28.bin
ba110148a641aa5c371b48ac5559617b991c9e72d753d56c4f0428c2c1aedd93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F28 8784 bytes

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