Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d10f4bb8525544…

MALICIOUS

PDF

92.0 KB Created: 2021-03-21 02:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b7d820b6c28be88452e6385094d58040 SHA-1: 2fe68079e33482f5a075eea20f046f61fed93cdc SHA-256: 88d10f4bb85255447272932f1bf395d12595067de64951b3fcf8699c051e4ef8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs indicate an attempt to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=science+olympiad+ornithology+rules+2020 PDF link annotation
    • http://komaxinatobofe.medianewsonline.com/windows_shortcut_keys_print_screen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_6042c311bdb2f.pdfIn PDF document text
    • https://cdn.sqhk.co/zabadiripo/fnghjh3/77702880046.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/foolish_beat_debbie_gibson.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/december_2020_calendar_waterproof.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/iadhjhc/71361642619.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/jhfjbvf/dwight_yoakam_baby_don_t_go.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/56228291373.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/1894877982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409998/normal_5ff8d86bd236f.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/kannada_songs_bhavageethegalu_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff8b56ff13f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5feb9753ae50c.pdfIn PDF document text
    • http://tilosag.mypressonline.com/adrenal_fatigue_the_21st_century_stress_syndrome_download.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/fasawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevakop.epizy.com/whatsapp_de_colores_apk_uptodown.pdfIn PDF document text
    • http://gebetipuraxos.rf.gd/21522033544.pdfIn PDF document text
    • http://kakofuwogo.epizy.com/18267362258.pdfIn PDF document text
    • http://subejev.rf.gd/zuteragal.pdfIn PDF document text
    • http://fonovituten.rf.gd/77158559286.pdfIn PDF document text
    • http://lojetewope.epizy.com/zezaduruliwevo.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/bungsaufgaben_binomische_formeln_mit_lsungen.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 5964 bytes
SHA-256: 76005113fc5094427310d3ece635f2848f7ff378db81e6837f806478bf8eba38
font_01_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 11508 bytes
SHA-256: b72d9e87f387847a24709339566c3ccbc4f529eac5539b0a8216d84654927eaf

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