Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b1c774716e1662…

MALICIOUS

PDF

81.5 KB Created: 2021-04-17 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f5c8ee886d034e2646daf11b7b0cf1ba SHA-1: ec019940c394ebfb23e8a10c98afecedb2de5795 SHA-256: 21b1c774716e166291a85f75fb2aa7ad9d70dfede1b95eac4c5d9766acf46011
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute further payloads or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, suggesting a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=diary+of+wimpy+kid+rodrick+rules+pdf PDF link annotation
    • http://vorgazme.com/62717533817qyu4v.pdfIn PDF document text
    • http://instasale.company/network_guide_to_networks_8th_edition_access_code0jx87.pdfIn PDF document text
    • http://interbankdigital.com/how_to_bake_bacon_wrapped_chicken_legs6bwuj.pdfIn PDF document text
    • http://cheatyou.site/jaxupefedasikejutozomo21ei5.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/diahdjf/army_clash_no_ads_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a4d31c92a.pdfIn PDF document text
    • http://xulikode.iblogger.org/blank_space_vocal_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/wijhjlr/taxi_driving_simulator_2016_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_600da3b5e68c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_606cf6a2dbad5.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/ge5gdjh/85904412565.pdfIn PDF document text
    • http://salearea.pro/256441026409a7q5.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/aUx2Vja/regal_cinema_16_dollar_movies.pdfIn PDF document text
    • http://youralteragoods.com/tazunimosuzerubotifetiev13y.pdfIn PDF document text
    • http://makeyourself.xyz/rilanuvok7r8y4.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/44ifQih/bubble_wrap_stress_relief_game.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/WsTwie1/drifty_car_chase_mod_apk.pdfIn PDF document text
    • http://xexogafuko.22web.org/widusawiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_601f23782664b.pdfIn PDF document text
    • http://fewemika.66ghz.com/besigilelozofep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_601dcdaab3323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokogukuvuxe.rf.gd/51661936182.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_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 5560 bytes
SHA-256: 32f1f61e71e1d0b0ed1d5a47a7edf157635e66d98c29c87367f45fb8b1fc0df4
font_01_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 10508 bytes
SHA-256: f61598f3b4055e933fd53950020f18f9601ec32c8409afffb499ca45fa647d8e

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