Malicious PDF — malware analysis report

Static analysis result for SHA-256 907b87aa62d526e5…

MALICIOUS

PDF

91.6 KB Created: 2021-04-20 18:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b70db6a8f64cbc59bcb37b95ecfafa59 SHA-1: ddc42d6720121088d481f256e77bf0eb921acf36 SHA-256: 907b87aa62d526e578c624e45f22db799c8103b92fb35fca998284440a124e57
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to host malicious content or phishing pages. The presence of a critical ClamAV detection and ML classifier flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/strik?utm_term=antiderivative+of+cos%2528x%255E5%2529 PDF link annotation
    • https://jupedarer.weebly.com/uploads/1/3/2/8/132815187/sufup.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/ifhfiiS/skooler_parent_login.pdfIn PDF document text
    • https://ronunafo.weebly.com/uploads/1/3/1/8/131856498/65991b.pdfIn PDF document text
    • https://zenijubam.weebly.com/uploads/1/3/4/8/134884092/3982982.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/ajfEgiV/business_strategy_interview_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/what_are_the_a_b_buttons_on_roku_remote.pdfIn PDF document text
    • https://gagebopa.weebly.com/uploads/1/3/6/0/136051288/ninok_togorenimi.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/video_cutter_app.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/gosivowowan.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/iegh3CI/donamejus.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/chb7a1O/just_dance_now_apple_tv_review.pdfIn PDF document text
    • https://cdn.sqhk.co/binebelezux/jjkCida/wrecking_ball_miley_cyrus_mp3_song_free_download.pdfIn PDF document text
    • http://vavawosasote.iblogger.org/govanobubasaxigememu.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/TieKbcg/37074560778.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/gdrhg2j/thinking_in_java_book.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/0e6jeI3/hidden_valley_resort_phillips_wi.pdfIn PDF document text
    • https://xeluluferira.weebly.com/uploads/1/3/4/2/134266649/semexiradewifiw-janebej-nupigeno.pdfIn PDF document text
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/1561051.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/masigedatiler.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/3935520.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/charities_registration_form.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/ddd362c9b1a49c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezirateba.rf.gd/is_the_shark_vacuum_any_good.pdfIn PDF document text
    • http://zabidogadifosis.rf.gd/54368502007.pdfIn PDF document text
    • http://rusuxagek.rf.gd/zidaxalo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 5428 bytes
SHA-256: 66a15e49aec4270d1e8cf44e82d0f86cb1ccb45fce98792c60ed5090c996c089
font_01_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 12232 bytes
SHA-256: 6609d454642966020de9405024ce7f7b52e2d852e1bc0e1949a0b1231afa20b5
font_02_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 16064 bytes
SHA-256: 28c03bcf599e3456f71dbda7a9940e8017c4b7a6e15fdbd9d4eba8bfcd1a11e4