Malicious PDF — malware analysis report

Static analysis result for SHA-256 0684728dad3a33fa…

MALICIOUS

PDF

80.0 KB Created: 2021-04-10 07:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8f896e364ad79d084d5726614ca170c1 SHA-1: 62c40ca63e097530e6f01aeb67163e0fe23646aa SHA-256: 0684728dad3a33fadbf97d158fd291af94ac9ec11d7f7f3cc610214d4dc9795c
244 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by ClamAV and an ML classifier, and contains a large number of embedded links, many pointing to disposable hosting. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. While no scripts were extracted, the document's structure and link farm suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=tabla+de+equivalencias+de+unidades+sistema+ingles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_60380de54b455.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/rupejemibomexaxaxu.pdfIn PDF document text
    • http://damita.fun/62630409170bttd0.pdfIn PDF document text
    • http://alcexpress1.xyz/what_do_bombas_socks_costmunij.pdfIn PDF document text
    • http://maewallace.com/3078405996802nyz.pdfIn PDF document text
    • https://kusufefa.weebly.com/uploads/1/3/4/4/134471409/matarumef_tugulonidub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_604e648d38711.pdfIn PDF document text
    • https://logomeso.weebly.com/uploads/1/3/1/4/131438572/2367760.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/fivoxal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_602ec49b865ae.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/1188395.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/ponewemifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_6058b0f6a0eba.pdfIn PDF document text
    • https://fulesinarube.weebly.com/uploads/1/3/4/7/134729099/73bc1e318993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_6046376480174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_2fd08716adf44787854f8eb148c1fb49.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_882e29e251144dcb885083b8252d0a35.pdf?index=trueIn PDF document text
    • https://a97cc435-ef8e-4ffb-8544-4b9c0bda5a6e.filesusr.com/ugd/7ab440_7e0fa995e4584144abc67ba855c08111.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 5212 bytes
SHA-256: 391cd0470a15d58d2432b893cf86421e14bd0eda374673069934205bc4e7ddf4
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 11828 bytes
SHA-256: 1f18506719d59cd82660d7d1f2bbab31b072c1507d9702026e8a7db8bc41ee8e
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34