Malicious PDF — malware analysis report

Static analysis result for SHA-256 798817b23a599a12…

MALICIOUS

PDF

80.9 KB Created: 2021-04-26 11:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5d927bc6dc26eada3fbe8a7e347b027a SHA-1: d4bee32b11d283caf469c2d65532c88924fdec76 SHA-256: 798817b23a599a122373f2b3e44e87e484a2cc8fb55b23f964da8b82e79095f9
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, specifically for phishing and link farm activity. The document body, though heavily obfuscated, contains text related to phone support lures, consistent with the 'SE_CALLBACK_LURE' finding. The presence of numerous external links, many pointing to disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://soxebez.ru/strik?utm_term=how+do+i+unmute+my+ringer+on+my+vtech+cordless+phone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcf47c5d053e.pdfIn PDF document text
    • https://sujugixuguxidi.weebly.com/uploads/1/3/4/6/134615921/vigakuwib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_6046ba76d663c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5ffc82fdb9dc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418781/normal_5ff22ab9a6acd.pdfIn PDF document text
    • https://nelizozab.weebly.com/uploads/1/3/0/8/130874358/ragosugonuwig.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/5059855.pdfIn PDF document text
    • https://tedibajibivo.weebly.com/uploads/1/3/1/4/131406927/3457679.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/kokidoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_6003d62f69d58.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://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_d9048399e39a4225a4d01637b2c06cc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/752b0dec-cc65-46fc-8eb1-76abd8f2dc26/mududipizorisanedofarut.pdfIn PDF document text
    • http://tukaxowelu.rf.gd/ib_approaches_to_learning.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/elder_scrolls_online_bloodroot_forge_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1550f6a-541d-4c3b-8fd9-7135bb0566fc/epson_artisan_810_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3514c173-ef76-4df0-811d-fa11259dcadf/ps3_move_harry_potter_book_of_spells.pdfIn PDF document text
    • http://jekalabol.epizy.com/candide_voltaire_resume.pdfIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_439d1653db294df98c8f0083d69064ed.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_9bdd8f1d73f14601a08663b382415473.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_5c36e78d2a3843fa9fec1c0d2191799b.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_4e38adae85d54508916067eb68d7174f.pdf?index=trueIn PDF document text
    • http://kazowaz.rf.gd/xuludopumajafadowuxom.pdfIn PDF document text
    • http://gevasonajudot.epizy.com/how_to_use_my_casio_fx-9750gii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5f4a0f-89f8-401a-9c83-ba414ecd70f5/yard_machine_riding_mower_repair_shops_near_me.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 5372 bytes
SHA-256: 5da3ed27af4addb4d2b5f219821442de8995e40f2031e6808d3a26fe962b6b55
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 10888 bytes
SHA-256: 1972765d3108472a9387babdc1802184396f383b2f54e516c19fc5aac3191c80
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333