Malicious PDF — malware analysis report

Static analysis result for SHA-256 371807b03f1b983b…

MALICIOUS

PDF

68.6 KB Created: 2021-03-14 08:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6c2027c76a17176640ad36d447486c47 SHA-1: e7ec092d6412c80389f6c3cc6ccf8620d19018b5 SHA-256: 371807b03f1b983b6d78f20fb847ad908857967c62f8bad180335cca8c100a08
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=cartoon+kiss+hd+wallpaper In PDF document text
    • https://cdn.sqhk.co/litopozuf/0gihdUg/valkyrie_profile_lenneth_psp_cheat_codes.pdfIn PDF document text
    • http://marabogujuj.iblogger.org/yunus_cengel_heat_and_mass_transfer_solutions.pdfIn PDF document text
    • https://jefomigakugilo.weebly.com/uploads/1/3/4/5/134597358/saxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_60485e6eed080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477173/normal_5ff33aca78f1d.pdfIn PDF document text
    • https://wigowuwadapol.weebly.com/uploads/1/3/5/3/135315864/motitivi.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/G8wggje/wordscapes_level_8516.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/55ddc4405e29846.pdfIn PDF document text
    • https://wutifanuviwi.weebly.com/uploads/1/3/4/0/134041095/dikiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_6002c250a61bd.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/ritopopege.pdfIn PDF document text
    • http://xivibogo.22web.org/30209594398.pdfIn PDF document text
    • https://fimezerix.weebly.com/uploads/1/3/4/4/134478386/ec3cc.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/dnDiagi/new_best_whatsapp_status_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/wheVheb/best_mirrorless_camera_deals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipawewori.epizy.com/zuxujigexadijekolas.pdfIn PDF document text
    • http://xixonuw.rf.gd/the_magicians_season_4_episode_10_imdb.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/zedopopifex.pdfIn PDF document text
    • http://gekuwixaritaxe.epizy.com/zabramski_cavernous_malformation.pdfIn PDF document text
    • http://romakilax.myartsonline.com/94028919846.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/18276739129.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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 5108 bytes
SHA-256: 70f0fddd324ee9ac48f1465d14de3637d758952ccd96567067aba56713a97d84
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10148 bytes
SHA-256: 57ee135dd642641951adeda2d11267433a9609946312b827c9b51e0ba21b3474