Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f814afb6c33412…

MALICIOUS

PDF

40.3 KB Created: 2020-06-03 19:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0a1872eca48edd9e502686f2e09b9a8 SHA-1: 5e27f124726ebca4a79367eea0690d7114264409 SHA-256: f3f814afb6c33412dd6ea88bbccfc6d464fadddfb6ac146876662288e30097df
94 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, many of which point to PDF files on unrelated domains, suggesting a link farm or SEO poisoning tactic. The document body mentions 'Chick fil a employee rules', which is likely a lure to encourage users to click on the embedded malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment.

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://apparelsewingusa.com/uploads/1/3/0/5/130540401/130540401.html#chick+fil+a+employee+rules
    • http://therealhousewivesofloudouncounty.com/uploads/1/3/0/8/130813054/1120853.pdf
    • http://athenianci.com/uploads/1/3/0/9/130969706/5120648.pdf
    • http://favershomes.com/uploads/1/3/0/6/130604105/zuzewanelawepukawane.pdf
    • http://hkcfoundationforparkinsons.org/uploads/1/3/0/4/130483990/wunid-wezomixobu-muboridozer-zaxerilul.pdf
    • http://solutions344valante.com/uploads/1/3/1/0/131069838/xopevizisafuri_xosab_jakurukazewemu.pdf
    • http://apparelsewingusa.com/uploads/1/3/0/5/130540401/terms.html
    • http://apparelsewingusa.com/uploads/1/3/0/5/130540401/dmca.html
    • http://apparelsewingusa.com/uploads/1/3/0/5/130540401/policy.html
    • https://jewarugunizu.files.wordpress.com/2020/05/fegisujejageroze.pdf
    • https://pewinutol.files.wordpress.com/2020/05/74661443560.pdf
    • https://wajofub.files.wordpress.com/2020/06/96671206369.pdf
    • https://vorapizogu.files.wordpress.com/2020/06/44294573874.pdf
    • https://foxunisi.files.wordpress.com/2020/06/vosovu.pdf
    • https://gelepulag632881419.files.wordpress.com/2020/06/xujele.pdf
    • https://fojesezowivi.files.wordpress.com/2020/06/78500981493.pdf
    • https://lorimanugolu303520256.files.wordpress.com/2020/06/jiposulufikulowi.pdf
    • https://xuwafudigele.files.wordpress.com/2020/06/1050920286.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007229.bin
3d92695f0071390d5efdd6bb47ad21b11932d23496c7aa69be11164fd643b644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7229 10348 bytes

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