Malicious PDF — malware analysis report

Static analysis result for SHA-256 5800b59412f14df2…

MALICIOUS

PDF

72.5 KB Created: 2021-06-08 05:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 85827a7011bb258c963c50cf34de4c62 SHA-1: 603a65a82359b789f0f7dd7213dad6ccb191b1cc SHA-256: 5800b59412f14df2a2cb213ff547562ffb7cab70bd7eced8b5d7601148b4b6a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting it functions as a link farm. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a query about contract buyouts, which may be a lure. The presence of embedded URLs and the overall structure strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/pbw?utm_term=how+does+spectrum+buyout+your+contract PDF link annotation
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/369172.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/fezukubabuwa-sudekesasege.pdfIn PDF document text
    • https://tovadifu.weebly.com/uploads/1/3/4/0/134096489/fetuzow.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/fufudemowiwak_razisifowap.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/241128.pdfIn PDF document text
    • https://medivikula.weebly.com/uploads/1/3/4/8/134883054/gelemuwoxilapix.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/5976822.pdfIn PDF document text
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/bc7d49b.pdfIn PDF document text
    • https://xexumure.weebly.com/uploads/1/3/4/8/134885566/xuxolujizus_romozuludof_neziwaleku_xuvufokope.pdfIn PDF document text
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/448a7417740.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/890ac1c8-2171-4968-a8b6-3d3c1dbbd347/zojisivarigubavul.pdfIn PDF document text
    • http://goxeguj.pbworks.com/f/ubuntu_install_flash_drive_uefi.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144834549/tera_chehra_jab_nazar_aaye_mp3_ringtone_download_adnan_sami.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/filmora_8_free_download_for_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f8775f-fc55-4ce4-aa80-e4687511dc42/barrons_sat_book_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9f66c3-ffe4-4365-b486-eb443575a6f9/youth_soccer_training_sessions.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144539022/8.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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 5484 bytes
SHA-256: ad4e688c5b7ed5189458ac56956564bd0d1f235cb42652bb74f553fe707732b5
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 12520 bytes
SHA-256: 952c4e06839c66fae53668c829900669b4d308bb8e0884a5881b424714ce1f75

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