Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4d8a455c70b908…

MALICIOUS

PDF

83.0 KB Created: 2021-03-20 20:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8e662154683b249827ac8877e9d010cf SHA-1: 2e7c8f43775fe3ed5bcadd98b552cf1c55462033 SHA-256: 8d4d8a455c70b908623cde9454bae815df1489b4838b047cbb1fb2742bff5627
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=nordictrack+x7i+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5feb95dfa3eba.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/MXXhi9D/gebubunaxoru.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/9232209.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/855001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_602c84aa4ca7e.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/26280649319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_6025dc79633a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_6022c4df22cc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_6007308cd3835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fd9e77d6321c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_60563360546d0.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/BidIhiM/bafanagabilomotoki.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/british_english_grammar.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/is_gimp_safe.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/mavesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_601a62c520913.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/how_long_to_study_real_estate.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/7385d5e2.pdfIn PDF document text
    • http://belofakomag.mywebcommunity.org/dalomudobajebowivuvefu.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/californication_fingerstyle_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/nexupumile/Kngdgno/darkness_rises_and_light_to_meet_it.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/kanel.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
    • 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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 4900 bytes
SHA-256: 7b1581aaa55d12add356ae4bb2cc3d701e9ebbb3fadcac4752a155ce7f70c5b7
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 11908 bytes
SHA-256: 0431c808c5141c33c8eca42d9080b9cef4ea1272114907ed1f0dfa9e2559ed2a
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333