Malicious PDF — malware analysis report

Static analysis result for SHA-256 851f6dfa23ba7e2c…

MALICIOUS

PDF

80.7 KB Created: 2021-02-27 23:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c894148c1ffa623035d6a560113078b6 SHA-1: 91f22f81c77e38cbb42b0aa9bbbe534af83f9bde SHA-256: 851f6dfa23ba7e2cdf11b5e3c1b4eecbff50f9642920a537334d0243896c860e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=what+are+the+5+steps+to+reduce+food+waste PDF link annotation
    • http://barajofa.mywebcommunity.org/honda_eu2000i_parts.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/mezazajisiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/ejfgjor/float_tube_multitasking_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/ijgcghc/motorcycle_wheelie_trainer_spyder.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/A3tQrjh/yt_love_dirt_jumper.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/jf3gjgf/vertigo_racing_mod_apk_revdl.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/are_smart_scales_safe_to_use.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/delonghi_magnifica_s_smart_fully_automatic_espresso_reviews.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/lokevuguzovelajumijisalo.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/fhfhfjN/ultimate_vpn_full_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/DjiG5jg/92260809065.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/pdf_el_juego_de_la_vida_y_como_jugarlo.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/50686821289.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/how_to_change_oil_pan_gasket_on_2008_dodge_avenger.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/fafudaxax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwivazud.onlinewebshop.net/71863452539.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/2019_amc_8_problems_and_answers.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/how_big_is_the_g_shock_rangeman.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/27846303774.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_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 5440 bytes
SHA-256: 07839efd79ca5e271d9cf39fc2e6490de640c22052b542e33caa8e5a5f8e209d
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11040 bytes
SHA-256: 53f75d1792aab665d6fff5e635e809ca1af77a7cd9833c021bff1ae0f863bb11

Open this report in the interactive analyzer, or submit your own file for analysis.