Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef0ad8811bfe099…

MALICIOUS

PDF

46.3 KB Created: 2020-04-03 18:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 10371d6d13dfd9c21dbe078706225082 SHA-1: 8fe80f4f2282b87d345ada98a0bb734f307944f3 SHA-256: 5ef0ad8811bfe0995678d6a25b1bb00fb4d8a1981ae5363dc6d5233203b99d2d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing numerous external URLs disguised as a firmware update. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass of external links, likely intended to redirect users to malicious sites. No scripts were extracted, but the document body and heuristics point towards a social engineering tactic to drive traffic to potentially harmful content.

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://annkellettghostwriting.com/uploads/1/3/1/4/131406930/131406930.html#onkyo+tx-nr616+firmware+update+usa PDF link annotation
    • http://dodafit.com/uploads/1/3/0/2/130272582/2843444.pdfIn PDF document text
    • http://instlarcafe.com/uploads/1/3/0/2/130289583/jikumerewalu_bakez_xonudaret_jozolelazimog.pdfIn PDF document text
    • http://angela-devine.com/uploads/1/3/0/5/130588688/1325836.pdfIn PDF document text
    • http://dimaggioconstruction.com/uploads/1/3/0/4/130477245/tidozejabadaw.pdfIn PDF document text
    • http://zimpat.net/uploads/1/3/0/4/130483550/1251991.pdfIn PDF document text
    • http://alexaleighfletcher.com/uploads/1/3/0/6/130604434/d27a02085707.pdfIn PDF document text
    • http://gchameleon.com/uploads/1/3/0/6/130639538/puxixomete.pdfIn PDF document text
    • http://cliktok.com/uploads/1/3/1/3/131382696/3367237.pdfIn PDF document text
    • http://danielamora.com/uploads/1/3/0/5/130551994/worabeviful.pdfIn PDF document text
    • http://appropertysolutions.net/uploads/1/3/0/2/130288802/f3497f1a.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_off00006de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 7904 bytes
SHA-256: 423e7fc5694f4273cdd8747c96c3927ca88d207e1c689e828fd3590f9863b7c4
font_01_sfnt_off00008cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBD 2628 bytes
SHA-256: a56bd5ca61d7c27fcf76b48a55b46fabe7ae1264652afd3190dbadd76b62d8e6
font_02_sfnt_off0000960b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 16160 bytes
SHA-256: 2f79ba52acca039e5c354f09c372eb8b3e5c303dfc88b98fa2ec462876c681ba

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