Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7627c0652e8cb4…

MALICIOUS

PDF

36.0 KB Created: 2020-04-10 06:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bb3eb4171f64fd981bdf81e28f9bbc50 SHA-1: d4b920cfc75f22439519aea1dc90060bdf1c34cf SHA-256: af7627c0652e8cb421ae143031d524a6c724e5b760fc14bf40c8d30db91c5980
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO link farming or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body contains garbled text and embedded URLs, suggesting it is not intended for human consumption but rather as a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kellysouthernwoodcrafts.com/uploads/1/3/0/6/130621656/130621656.html#co+pret%C3%A9rito+indicativo+de+comer PDF link annotation
    • http://wildcat-wifi.com/uploads/1/3/0/5/130551586/6b346d7131e.pdfIn PDF document text
    • http://thejeffreyamcleanfoundation.org/uploads/1/3/0/6/130604215/pakezuw-zamuxuzagerulan-rajijeripoguju.pdfIn PDF document text
    • http://2illumeartstherapy.com/uploads/1/3/0/4/130483848/dufumejulodop-zotivir-pudas.pdfIn PDF document text
    • http://autocarstuff.com/uploads/1/3/1/4/131410747/1645272.pdfIn PDF document text
    • http://sitevents.net/uploads/1/3/1/3/131384227/jijufi_bobiz_senufifuje.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

Related samples 6

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_off000053bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BC 6784 bytes
SHA-256: a0eb513f767fd3f66b0a7edb078326ad72333d4e55c2762df942191dc77d0c19
font_01_sfnt_off00006c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C05 16084 bytes
SHA-256: d65752e558a9090157c9a1b02647c04d2680198cf9d52ff42939ef8ccbf7fabd

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