Malicious PDF — malware analysis report

Static analysis result for SHA-256 c436a2f365693e1d…

MALICIOUS

PDF

67.7 KB Created: 2021-03-02 17:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cc01b16a6597aca0264c4e891e610f00 SHA-1: 41a0fe33803fb9aae9ef0e383ebcf9603e1314f8 SHA-256: c436a2f365693e1dd9c283e1817d0b4a7506ec20eb8adb3051b07fa46bed8d0e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The embedded URL and the document body, though heavily obfuscated, point towards a lure related to appliance repair or product information. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://ponafet.ru/strik?utm_term=fisher+and+paykel+smartload+dryer+not+heating PDF link annotation
    • https://cdn.sqhk.co/pikukafil/whgBFhe/homeschooling_programs_in_missouri.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/bjiidgi/18929013998.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/gJVheje/putojogukimibazobadefo.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/jcWcljr/plants_vs_zombies_garden_wars_2.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/6YyN0he/67475802474.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/hSjhwjd/monkey_island_live_wallpaper.pdfIn PDF document text
    • http://rubivof.22web.org/28440710075.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/ezwjwS1/zililekefonunarew.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/icTjgy1/rally_championship_xtreme_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/jd0N5uj/adventure_capitalist_earth_guide_2019.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/womojadapimananevidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijivegopu.rf.gd/lumix_fz2000_test.pdfIn PDF document text
    • http://bitugoxopezuwu.rf.gd/kadukamanezowogupuwubilis.pdfIn PDF document text
    • http://pisasegobure.epizy.com/wosipuleloserug.pdfIn PDF document text
    • http://mujepivetum.epizy.com/2019_can_am_outlander_570_service_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA98 5492 bytes
SHA-256: ee29f5c7a357fb8cf0c2fb4cb23e5d42b1a2493d448f992d3d60bdcc112c6d69
font_01_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 10920 bytes
SHA-256: cc98260ea2caf012c4c514d541f8f60da64266e1266deae90c8395758f09b0f8

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