Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0a341cff92f13b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-18 18:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b37dcddc9d1ef05eac43e35cedff94fa SHA-1: c8267ecc6be397223c2f0b94a1fbecd0adad3fed SHA-256: 3c0a341cff92f13b8e6d8ac0388669139f4373ff83583ec8f8b1fb2b483ca65d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=sonic+duo+scrubbing+won%2527t+spray PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380411/normal_601c5c8a5a76a.pdfIn PDF document text
    • http://totalcreditreport.info/sql_server_disaster_recovery_plan_template3gpi8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367312/normal_600934ce078c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_600ca84eb492f.pdfIn PDF document text
    • http://xsafak.com/36949216055f2n6f.pdfIn PDF document text
    • http://creamwalls.online/decimals_in_words_worksheet_grade_4156g1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5fc9b25c62815.pdfIn PDF document text
    • http://investmag.org/embassy_of_the_democratic_peoples_republic_of_korea_in_bangladesh9tepu.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/jozawuroxerotive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_601d89b882dd3.pdfIn PDF document text
    • http://216tilford.com/which_of_these_choices_best_describes_probability9zoz6.pdfIn PDF document text
    • http://mamontov-net.cc/71671184938bk42r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366384/normal_5fff3a6c45d30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5ffa16360bbb0.pdfIn PDF document text
    • http://intekzafast.online/attributional_style_questionnairege54o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_600f359f05574.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/sepazusasomuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_60401548c7230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_6046cc6f65846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd31c651fcf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulutugorivexek.atwebpages.com/venice_a_documentary_history.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/nugobelajob.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/putana.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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 5680 bytes
SHA-256: b3704311422fd9f992043f78e35f620aee41f664bca8c5fcedfc5c51f1fb4387
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 11636 bytes
SHA-256: 062c57a44d8ffc129c0436766b49faca3da7c7955a80d745267fe9f09ff09dd3

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