Malicious PDF — malware analysis report

Static analysis result for SHA-256 82604640f1b1bff8…

MALICIOUS

PDF

90.9 KB Created: 2021-03-30 05:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8ed062b5f5a7da0ebf1543439ab676e4 SHA-1: 2739f682c76dde89582e468d7dd890f1b2e26785 SHA-256: 82604640f1b1bff8582b6b6d1841e75e7f14e6779e79e144aeec3f5d0995f931
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm with numerous external URLs. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content or for SEO manipulation. The presence of multiple disposable domains and UTM parameters in URLs further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=calendario+escolar+2019+pdf+guatemala PDF link annotation
    • https://cdn.sqhk.co/xavexapoxiv/gdhgjeF/16251070803.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/2801e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fcaf12d6864c.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/8444934.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/iihcJjf/love_letters_for_him_that_make_him_cry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5ff1e02cda8be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fe5f3cb62ac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_5fe87a138a8c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_6032a8cf4a85c.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/gehG73x/24872447173.pdfIn PDF document text
    • http://fuwajigub.iblogger.org/economies_of_scale_occur_when_a_firms_long-run_average_total_cost_curve_is.pdfIn PDF document text
    • https://cdn.sqhk.co/papovezegep/hQKsoja/free_bible_verse_wallpaper_android.pdfIn PDF document text
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/fotadamofuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovika/jiEhgig/boku_boku_apk.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/e6664a59-03e7-4020-8536-59458a8a887c/the_diary_of_an_oxygen_thief_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7faa6d18-28eb-45ca-87f5-2e5333339404/what_is_cognitive_developmental_theory_of_gender.pdfIn PDF document text
    • http://tinozireru.epizy.com/captain_kirk_uniform_color.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/weather_report_live_map.pdfIn PDF document text
    • http://xikexugisomap.rf.gd/importance_of_variables_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9178dca7-7c2c-48e9-8cd4-70aa0083c091/88622589067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cab6403-a723-4a6b-9b9f-86b6563f7ccd/zagg_keyboard_ipad_pro_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df0f102-e431-4fcd-a7a0-9748ce1f8039/buzakovubovatuniruxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ba5934-3a11-487a-84db-fedff6af55e0/dexexenozipezopoxe.pdfIn PDF document text
    • http://gopasupefiden.epizy.com/matrox_monarch_hdx_reset.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_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 5860 bytes
SHA-256: 52d1ae14d211975867f362eab6a1e01a89610170fdaed4e8d35f1f2322e82e34
font_01_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 11024 bytes
SHA-256: 8dc29071eaacb1f6e08169f4b6c654a9d22069555b2da662b20a5dc589f19122