Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a35d5f9215c812…

MALICIOUS

PDF

76.3 KB Created: 2021-04-11 02:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56f8d1871ad8e2fd864cc33f7e656ee1 SHA-1: 5e352a6ac78c94efe9d6722e07b16725c6d7aa18 SHA-256: 37a35d5f9215c812ea9fce8d18bcc59a6d583fe5d9c67972dae17c3c8b0e2c24
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+to+knit+socks+on+circular+needles+video PDF link annotation
    • https://cdn.sqhk.co/libuzewis/giTthlX/nicalis_physical_switch_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/4tgcgjs/52021732942.pdfIn PDF document text
    • http://dugules.iblogger.org/78665956891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5fee3eb46377c.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/fojukojibimofukaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_604cbc68dfa89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_605340aee3b80.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/idGm8GS/baseball_scoresheet_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_601f1fcf34198.pdfIn PDF document text
    • https://vipunufevewe.weebly.com/uploads/1/3/0/8/130874016/5e649599ac37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480748/normal_5feee92a31323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_6031cb90aed7b.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/sigomesezumawe_viturizalepe_tuluvumuwuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_606de4e27bade.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/yhZ5jhv/eliteone_800_g3_disassembly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_6015b4736201d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5feba73d0dbe5.pdfIn PDF document text
    • https://jowuxedajaris.weebly.com/uploads/1/3/4/7/134716551/8363007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_606e849babc64.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/cFvkAQV/63682838705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenemusexo.epizy.com/pazubitanetemega.pdfIn PDF document text
    • http://fisolimemokuwo.rf.gd/statistical_quality_control.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5108 bytes
SHA-256: d419c12c0ec3034dbd2d0ec8f5797a587aaaa767c43252010833b775b709497f
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 10768 bytes
SHA-256: 964c9748144cbb3f403bd0f57cf3ede960868b752c0b8db52429dcf3e5e73b6b

Open this report in the interactive analyzer, or submit your own file for analysis.