Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea35907b3075be50…

MALICIOUS

PDF

52.7 KB Created: 2020-04-12 01:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: b758d74552782a8661128b0ac09a0aa6 SHA-1: e38fb4b179c9818203d65835ae01be546eb530dd SHA-256: ea35907b3075be50e8560df85737479d73b9942e87e6bbee68cea1c9a45b0d55
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be directing users to a network of websites, likely for advertising, phishing, or distributing further malware.

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://escorti-milano.com/uploads/1/3/0/5/130541443/130541443.html#not+write+past+simple+of+the+verbs PDF link annotation
    • http://lakeholcombe.net/uploads/1/3/0/8/130814411/8369514.pdfIn PDF document text
    • http://shaleyeah.com/uploads/1/3/0/7/130775199/7516820.pdfIn PDF document text
    • http://mymcaroadsideassist.com/uploads/1/3/1/4/131437445/3230258.pdfIn PDF document text
    • http://fshmason.com/uploads/1/3/1/4/131454984/9604580.pdfIn PDF document text
    • http://drivenbrand.com/uploads/1/3/0/7/130738501/ximud_sizekadepe_jivozetasowori_zotusirabexaxo.pdfIn PDF document text
    • http://frackingprosandcons.info/uploads/1/3/1/1/131164456/bivagetaw.pdfIn PDF document text
    • http://studentpower101.com/uploads/1/3/1/3/131381142/5147902.pdfIn PDF document text
    • http://rebootent.net/uploads/1/3/0/5/130550890/b6da2c8febb4.pdfIn PDF document text
    • http://katebarclayconsultingltd.com/uploads/1/3/0/2/130270903/sokowolomilaz.pdfIn PDF document text
    • http://capcitymadison.net/uploads/1/3/0/4/130483561/7326621.pdfIn PDF document text
    • http://andrewbroomepianist.com/uploads/1/3/0/7/130776745/tesedajazazama.pdfIn PDF document text
    • http://jdrconsultancy.net/uploads/1/3/0/5/130590375/8057ea06f9d0ab.pdfIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000867c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867C 8708 bytes
SHA-256: dfb100e987d42b81273863fd3abea0161fb5b641172267728f1f26577dbd81e8
font_01_sfnt_off0000a7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A5 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
font_02_sfnt_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 16080 bytes
SHA-256: 8aa8646ccb736363f3087c90c16db2c208ceba3ef463bd505d6c2cd1febe6923

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