Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c1b7ee81dbe466…

MALICIOUS

PDF

42.7 KB Created: 2020-03-29 04:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1578c96cb096d2db1d3638bd65b6eea1 SHA-1: 9a6a8c258eafc5cf167786694276562d39a78f40 SHA-256: e9c1b7ee81dbe466168d7722718fc9077f0789245fa12b17fc262c7a0b333381
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains a large farm of external PDF links. The document body, though partially corrupted, contains references to the URLs, suggesting the primary purpose is to redirect users to these external links. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious content on numerous domains.

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-63-204-18-21.benefitplans.org/uploads/1/3/0/5/130550818/130550818.html#historia+clinica+ejemplo+completo+pdf
    • http://www.sanfrancisco-interactivehypnotherapy.com/uploads/1/3/0/4/130476442/8150624.pdf
    • http://semaiearts.fr/uploads/1/3/0/2/130291492/vipir.pdf
    • http://www.firehousedistilling.com/uploads/1/3/0/4/130488251/5d7bb78.pdf
    • http://hoosiersmallbusiness.com/uploads/1/3/0/3/130313588/7637060.pdf
    • http://goodandeasytaste.com/uploads/1/3/0/2/130272945/jafopowamamute-dirabumiresika-ruzozekusol.pdf
    • http://webmail.jzplabelling.com.au/uploads/1/3/0/5/130550763/6515963.pdf
    • http://financialmann.com/uploads/1/3/0/7/130775197/6984713.pdf
    • http://dvremodel.com/uploads/1/3/0/7/130776266/vezadenomize_tijete_gowojuvexixek.pdf
    • http://kmntech.com/uploads/1/3/0/3/130313429/fogorat.pdf
    • http://comedyshowcasedurango.com/uploads/1/3/0/7/130740533/4f0f492cfa710.pdf
    • http://americanstepdance.com/uploads/1/3/0/6/130604620/sazaroralo.pdf
    • http://ofa-ko.org/uploads/1/3/0/7/130740232/cdc18225fc702c1.pdf
    • http://www.mentalhealthwarrior.blog/uploads/1/3/0/6/130620490/337049.pdf
    • http://beatafurstenberg.com/uploads/1/3/0/5/130539881/gijovenesaz.pdf
    • http://notablecreationsco.com/uploads/1/3/0/4/130483561/wexewapupakix-lojigozubiwoni-fibuxigeberobir-rojelalejedur.pdf
    • http://nywfj.org/uploads/1/3/0/4/130435795/a832bc61fb.pdf
    • http://monkonmolokai.com/uploads/1/3/0/5/130550931/numudovar.pdf
    • http://www.martinasmithconsulting.org/uploads/1/3/0/5/130547884/levipurabokola.pdf
    • http://elliebowen.com/uploads/1/3/0/5/130590195/vagejeboru.pdf
    • http://biofouling.net/uploads/1/3/0/6/130605433/6552830.pdf
    • http://boda-boutique.com/uploads/1/3/0/7/130738915/nulurekerami.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_off00007a8a.bin
d21ed6c887d723e063d4002274b1a669c4ef4fb3eb2b7d3f9d534fa1d1781786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8A 9216 bytes

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