Malicious PDF — malware analysis report

Static analysis result for SHA-256 a733515044a9aaf6…

MALICIOUS

PDF

40.3 KB Created: 2020-03-27 06:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: 3c07955675b85b064b2c0aa69fa3ae2b SHA-1: 26981651c90509772151309b499ea314e17a5b44 SHA-256: a733515044a9aaf6381b6f97ad8845d31e7097faac9c2fc0305b43579b3cc595
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files on similar domains. The document body, though partially corrupted, contains text related to grammar exercises and mentions the wkhtmltopdf tool, suggesting it was generated programmatically. The primary heuristic indicates a 'PDF_SEO_LINK_FARM', suggesting the document's purpose is to generate traffic or distribute links rather than deliver a direct payload. The embedded URLs are likely part of this link farm strategy.

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://thescurlockgroup-promo.com/uploads/1/3/0/6/130621205/130621205.html#exercicios+sobre+ora%C3%A7%C3%A3o+subordinada+adjetiva+explicativa+e+restritiva PDF link annotation
    • http://cigarclubmodesto.com/uploads/1/3/0/6/130621533/doburazejilufoteve.pdfIn PDF document text
    • http://mail.fisioespaimanresa.com/uploads/1/3/0/6/130621383/satomawisomiwetuzar.pdfIn PDF document text
    • http://www.hallandcointeriors.com/uploads/1/3/0/3/130313610/xixadugegojivevelela.pdfIn PDF document text
    • http://phumelelaproject.org/uploads/1/3/0/9/130969264/rijefezisomum.pdfIn PDF document text
    • http://ailonline.site/uploads/1/3/0/2/130288397/82cfc484cdc22e.pdfIn PDF document text
    • http://hostmaster.painswicknaturallivery.com/uploads/1/3/0/6/130605325/vipugapamuwi.pdfIn PDF document text
    • http://movingtosantodomingo.com/uploads/1/3/0/7/130776077/7855467.pdfIn PDF document text
    • http://www.kurinjiflowers.com/uploads/1/3/0/6/130604949/422727.pdfIn PDF document text
    • http://westfieldrapids.org/uploads/1/3/0/7/130740378/nagewori.pdfIn PDF document text
    • http://wordsagain.xyz/uploads/1/3/1/3/131381036/logofakafowowovet.pdfIn PDF document text
    • http://www.dawsonspringsha.com/uploads/1/3/0/8/130815095/bowefodalu.pdfIn PDF document text
    • http://oldtymehockeyleague.com/uploads/1/3/0/6/130603828/riziv.pdfIn PDF document text
    • http://www.beautifulyadorned.com/uploads/1/3/0/8/130813953/7044790.pdfIn PDF document text
    • http://www.nidustheatrearts.co.uk/uploads/1/3/0/7/130776874/6aa20ee62e10a3.pdfIn PDF document text
    • http://campk97dogboarding.com/uploads/1/3/0/8/130814003/borudosodofu_lereku_minitebebisumez_wixive.pdfIn PDF document text
    • http://northernbeacheshousewash.com/uploads/1/3/0/3/130324451/fisirifave-sagusovubura-pasobewobu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9A 10184 bytes
SHA-256: a51e9fe07578a999844cbce692620b1f61f067592a1a3d48bf5e8c4255c85f26

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