Malicious PDF — malware analysis report

Static analysis result for SHA-256 c626c31b1f450e94…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 02:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 98ad4ce70e4674b522c6236d6a165194 SHA-1: b1d04eacf9e52fef9039feb4cbf9cad4c507daff SHA-256: c626c31b1f450e9428d74a133778b46d1cd72ab8a526fc7291c1f8fc9c12963e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=parenting+stress+index+italiano+pdf PDF link annotation
    • https://cdn.sqhk.co/revipidamog/Ehjsgjh/one_more_line_game.pdfIn PDF document text
    • http://smartradiobf.ru/ca_lease_agreement8v4my.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/xurujo-boxeruvamozeza.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/benaromujubi-bopirifog-ribupiniterumi.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/4280976.pdfIn PDF document text
    • https://cdn.sqhk.co/tusujoxaseru/jLiahiT/jekatibaju.pdfIn PDF document text
    • http://static-get.top/hero_xpulse_200t_top_speediy2bu.pdfIn PDF document text
    • http://damvglaz1.xyz/class_11_english_book_state_board0ph3k.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivunet/be9qR0m/subway_surf_game_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/lidfr8l/kavukewekijazuvopotitivi.pdfIn PDF document text
    • https://fegoluxojelab.weebly.com/uploads/1/3/4/4/134490239/vuvebazezob-pofatomejitar.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/kkheChi/2480619224.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/jahhhdo/66880726458.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/d43f3e2f8c4eaa8.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Ji3z5hb/mobile_ringtone_romantic_song_download.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/7f3a0f20-73c5-436b-89f1-f163824d1271/does_the_black_guy_in_green_mile_die_in_the_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5c6aa9-1c48-4ca0-a12e-189ce7f6773d/addition_chart_1-100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0fb43c7-bec1-4f26-847d-9686e78623b5/best_summer_quotes_tumblr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5360c36a-2dfe-468c-ba10-fc872e9ad088/the_5th_wave_sequel.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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5276 bytes
SHA-256: bb85faa74be19f755bba67c9079617ef769d8d9c26d78dbabca926f30e862b65
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10572 bytes
SHA-256: 670d170500d8e51bb0b9b31c507e838d129774400ec9a2737666e94b6d8326c7

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