Malicious PDF — malware analysis report

Static analysis result for SHA-256 a503d836378613a2…

MALICIOUS

PDF

46.2 KB Created: 2020-03-28 12:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: aab2eef28fd634887211f8460c719c51 SHA-1: db5565597ca3d58fa0ec8792134bd17af0206f4e SHA-256: a503d836378613a2c7909d65c3ab27c47d9367eb9eaad0619070f57158c086af
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains a reference to '36 estrategias china's pdf' and the authoring application 'wkhtmltopdf', suggesting a potential SEO spam or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious link farm operation.

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://timeframingconsulting.com/uploads/1/3/0/5/130539287/130539287.html#36+estrategias+china%27s+pdf PDF link annotation
    • http://mckowncounseling.com/uploads/1/3/0/6/130605112/vukojijevoga_votojowe.pdfIn PDF document text
    • http://pullingforhealth.com/uploads/1/3/0/3/130379409/beriwabizewufeliluz.pdfIn PDF document text
    • http://bilodeaulawoffice.com/uploads/1/3/0/5/130543053/nijopameju.pdfIn PDF document text
    • http://wendykuiper.nl/uploads/1/3/0/9/130969437/db5b8.pdfIn PDF document text
    • http://www.madisonwicbdoil.com/uploads/1/3/0/6/130640057/gefizudanidog.pdfIn PDF document text
    • http://cindyloveacoustic.com/uploads/1/3/0/7/130738619/fexirosilali.pdfIn PDF document text
    • http://easternmechanicalsolutions.com/uploads/1/3/0/6/130639283/mawetokumuka.pdfIn PDF document text
    • http://www.claytonheightsacupuncture.com/uploads/1/3/0/3/130323952/9eb5f2ff520.pdfIn PDF document text
    • http://burgessaircraftmaintenance.com/uploads/1/3/0/5/130589283/sezoxune.pdfIn PDF document text
    • http://dppersonaltraining.com/uploads/1/3/0/2/130270977/ece03b3effa29.pdfIn PDF document text
    • http://anniekoepkephoto.com/uploads/1/3/0/2/130270849/4719061.pdfIn PDF document text
    • http://mtrageserllc.com/uploads/1/3/0/5/130539287/9ca18f1a.pdfIn PDF document text
    • http://topguntattooing.studio/uploads/1/3/0/6/130639437/466583d616b948.pdfIn PDF document text
    • http://mail.threeoakwinery.com/uploads/1/3/0/7/130774990/a968077c4dd5e0.pdfIn PDF document text
    • http://moresson.com/uploads/1/3/0/8/130814169/3838204.pdfIn PDF document text
    • http://inscienceitrust.net/uploads/1/3/0/5/130538985/burewatam.pdfIn PDF document text
    • http://ownyourlinemtb.com/uploads/1/3/0/5/130551153/davenefegi_xolajab.pdfIn PDF document text
    • http://amillenialsovereigngrace.com/uploads/1/3/0/3/130313555/buteniruvenoxejujenu.pdfIn PDF document text
    • http://home-cyber-protect.com/uploads/1/3/0/2/130273993/422426.pdfIn PDF document text
    • http://smartsecuritysystemsllc.com/uploads/1/3/0/3/130313638/3128272.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: amandasdigitalbinder.com 4 samples

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7635 7712 bytes
SHA-256: 3e18c8b68e19abf7e00c5adbc387dfcff2a6c0a50d6880588c7596fb4b56920c
font_01_sfnt_off000093ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93EA 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d

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