Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a572cd664f0c9e6…

MALICIOUS

PDF

36.5 KB Created: 2020-05-21 05:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 6216f06f1a7b7734fafa72403dc758b3 SHA-1: 10ef786af2de3ee5dfb33133ff012e1063d71610 SHA-256: 3a572cd664f0c9e600df8c6ed6b912295099bdd59ea534af90464ae60ed3bb17
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The primary URL found in the document body is http://daily4ahealthylife.com/uploads/1/3/0/9/130969762/130969762.html#wilkins+720a+pressure+vacuum+breaker+manual, which is part of this network. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://daily4ahealthylife.com/uploads/1/3/0/9/130969762/130969762.html#wilkins+720a+pressure+vacuum+breaker+manual PDF link annotation
    • http://gallerysiestakey.com/uploads/1/3/1/4/131437535/lewukel-bezapubirerabi-kojutudegajime-fijemaxo.pdfIn PDF document text
    • http://santabarbarapestcontrol.net/uploads/1/3/1/4/131407968/1486dc.pdfIn PDF document text
    • http://southerndeltaboutique.net/uploads/1/3/0/8/130874029/557417.pdfIn PDF document text
    • http://duduslimmer.com/uploads/1/3/0/5/130543980/roxabujesufom.pdfIn PDF document text
    • http://imagineteas.com/uploads/1/3/0/5/130590569/873192.pdfIn PDF document text
    • http://annieflamsteed.com/uploads/1/3/1/8/131857565/sagijuze.pdfIn PDF document text
    • http://multirefrigeracao.com/uploads/1/3/0/6/130621646/503e554.pdfIn PDF document text
    • http://amitghule.com/uploads/1/3/1/4/131408788/5c0ed7.pdfIn PDF document text
    • http://destinyhopeplusfour.com/uploads/1/3/0/7/130740148/6cfe2c1d4e1.pdfIn PDF document text
    • http://occapto.org/uploads/1/3/0/6/130603828/6baa4773e193.pdfIn PDF document text
    • http://9f60ljd502.com/uploads/1/3/0/4/130477448/166300.pdfIn PDF document text
    • http://nomomani.com/uploads/1/3/0/5/130543006/zafowopefafixo-nesavedaxadu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5944 1644 bytes
SHA-256: 37c24baa18d0073ec8030c3588704cc78396206b8b2b974af8757a8904f74525
font_01_sfnt_off0000617a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 10300 bytes
SHA-256: cdb134fdbaafee11fe7f792d986ac54ea1f01ea0b79840a4f9a8e9955dab3ad0