Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf9e8dec94cb680…

MALICIOUS

PDF

53.0 KB Created: 2020-03-10 02:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eab6c754bc2f5e1f851985e7f8994908 SHA-1: b7e9b69a06b903b1a8fc5bdf494028c199f032cd SHA-256: dcf9e8dec94cb680b84efc92f4c802f178036a2c1a9e668b1707e2b540263def
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic specifically identifies this behavior, indicating a likely attempt to drive traffic to a network of linked pages. The document body, though partially obfuscated, contains a URL that aligns with this pattern.

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://www.bardosdiamondsports.com/uploads/1/3/0/5/130539241/130539241.html#nescafe+dolce+gusto+circolo+manual
    • http://immaginatefotografia.com/uploads/1/3/0/3/130323186/dde0562dd0dfc.pdf
    • http://4131southmeadow.com/uploads/1/3/0/6/130639581/noguvejanemakuga.pdf
    • http://lhs98.com/uploads/1/3/0/9/130969048/aeceb7a8c6c7a3.pdf
    • http://www.tharrisbgq.com/uploads/1/3/0/8/130874316/duwebegifudu_faxetodivot_modat.pdf
    • http://mta-sts.roamingcats.com/uploads/1/3/0/6/130621703/47093ae400dbf18.pdf
    • http://nsanegriplegendcarscom.com/uploads/1/3/0/6/130640025/zipobidezasude.pdf
    • http://bedonetmarmaille.com/uploads/1/3/0/7/130776008/1731326.pdf
    • http://www.jdassembly.com/uploads/1/3/0/8/130814247/84cf4a31d4d869.pdf
    • http://englandpaper.com/uploads/1/3/0/7/130738607/556dbb1002a.pdf
    • http://silk168.net/uploads/1/3/0/8/130814390/zapomunis.pdf
    • http://penninsulatech.com/uploads/1/3/0/6/130621727/448407d463f2b8.pdf
    • http://www.mayatcrawford.com/uploads/1/3/0/6/130604294/vanamijidono-likif-rabivegilo.pdf
    • http://www.houstonsustainabilitylab.org/uploads/1/3/0/5/130550679/2f52bf1a.pdf
    • http://beaufortvacationrental.com/uploads/1/3/0/4/130483684/zadesugedizezoguga.pdf
    • http://giovanniperi.dss.ucdavis.edu/uploads/1/3/0/6/130621758/gofiguwegosivodi.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_off0000a5fd.bin
217a4998c6176b997a713deefa6a7f868153a598c51bd30d341c3f52d5341b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5FD 8540 bytes

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