Malicious PDF — malware analysis report

Static analysis result for SHA-256 399b3c5e95be3605…

MALICIOUS

PDF

87.2 KB Created: 2021-04-05 04:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 88e1cb7bd60938e09f2da8483b9ee176 SHA-1: 1e5a6e6d95924cec0b9fc1948b7eafac3551a436 SHA-256: 399b3c5e95be3605a8c13cba3fcd6f349ad38dee3883e7b55a015414446c9a75
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its content, disguised as information about roofing sheet dealers. The primary URL, https://pelibifir.ru/123?utm_term=tata+bluescope+roofing+sheet+dealers+in+madurai, suggests a phishing or malware distribution attempt. The PDF_SEO_LINK_FARM heuristic firing indicates a large number of external links, many hosted on disposable domains, further supporting the malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/123?utm_term=tata+bluescope+roofing+sheet+dealers+in+madurai PDF link annotation
    • https://s3.amazonaws.com/sinadi/galarian_forms_memes.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/hhjg1sa/pebowalobuwu.pdfIn PDF document text
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/3810028f5b3.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jhiiExk/xozejopefekitomadu.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/gjURR4P/72440322431.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/66447272630.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/depaga.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/mizodewinuguroj.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/520dbee4.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/jcQMUie/mens_save_the_planet_vans.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/addition_and_subtraction_worksheet_for_class_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/vuvunomexudasinozetidis.pdfIn PDF document text
    • https://feriwixuwegixuf.weebly.com/uploads/1/3/4/6/134602873/sepejubire.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/7jc9Uhd/christmas_wood_cutouts_diy.pdfIn PDF document text
    • https://nobujudiwid.weebly.com/uploads/1/3/1/4/131452838/satusumubozuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/24079180020.pdfIn PDF document text
    • https://sipizoreju.weebly.com/uploads/1/3/4/1/134131451/kexofujagaxited_riwavusosafa_vafizegapa_pamezazinep.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/hcifgjP/53985057233.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/bgijehb/5660521968.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/1770532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf483204-dfb2-4e69-9cf5-21bf05d39583/30788915589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed29439b-9994-4f45-83f5-4a8f7960cef9/jvc_kd_r336_bluetooth_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d125c5-cabc-4f6e-9d1d-4823b95555e2/60873845644.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 6416 bytes
SHA-256: 2a69545f8a9d104697b847a0f548493cbc920d2d91a2c508c9ca03512f8941e1
font_01_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 5660 bytes
SHA-256: 2204a551c9f8d87bc5453991ea4fabd02c5f7666dfda89e35d9b36016d2df5f5
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 10736 bytes
SHA-256: 72f522151cd6b74aadecefafba99c060ed383eab3087698c1483bd2cb59b66dd