Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f32c7044f28c93…

MALICIOUS

PDF

87.3 KB Created: 2021-05-14 22:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d8a5900a5cf9d37a5dd4b2c70a2901cb SHA-1: 441e5bfa53a4fc8e99a2c77181f0ca2c3d49b93c SHA-256: 75f32c7044f28c9301bdf64f577d996551805849d2ee205db4f157e8928bd82e
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=how+to+measure+voltage+drop+across+a+fuse PDF link annotation
    • https://cdn.sqhk.co/xobakidanav/NHzgc68/xifibisagij.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/pdVjihh/mountain_bike_racing_news.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/geography_of_himachal_pradesh.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/19478965081.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/gikefoki.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/36Oibij/manualidades_halloween_2018_nios.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/anton_calculus_8th_edition_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/jgsifhf/76703528868.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/48924702842.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/temperamento_y_caracter_libros.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/chemistry_of_kariyappa_film_songs.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/3a966c15-13c6-4b7e-9e73-d73cd7e26688/fogixobufe.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/26993411342.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/steam_methane_reforming_reaction_enthalpy.pdfIn PDF document text
    • http://pewazeje.rf.gd/subajadadu.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/62749272947.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/pentair_whisperflo_shaft_seal.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/verbe_etre_en_anglais_forme_affirmative_negative_et_interrogative.pdfIn PDF document text
    • http://bamanitetazokav.rf.gd/zomowu.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/9718290424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf8e58c-1775-4c1f-a963-23904427f249/nelor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce8c304-f6fa-44d8-aa06-57875f93c38d/what_are_the_themes_of_a_midsummer_nights_dream.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/daminalapewome.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_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 5588 bytes
SHA-256: 842bd81807a10fc89204be35644a4c4dbe977c43c1f80ad35bf250dff8158681
font_01_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 11520 bytes
SHA-256: 25206ef55b3597c9475391dedc9ee2a9dbca7b0650b5a32400446fcc5b369a76

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