Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c222a7107d464c4…

MALICIOUS

PDF

79.8 KB Created: 2021-03-02 17:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e757f73b5041ac95095a323721796129 SHA-1: 7917ec458edbffc52619ba3b9059ae502872cef4 SHA-256: 3c222a7107d464c477714161e266a07e0782b054ad11c86721032fa99db9f14a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate effort to create a network of redirecting URLs. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=crash+course+haitian+revolution+transcript PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/R9heVgh/guide_for_free_fire_2020_download.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/fenuv.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/dupom_nabobonanuse_fetur.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/4vkjhsH/sports_heads_soccer_la_liga_unblocked.pdfIn PDF document text
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/635760.pdfIn PDF document text
    • https://ziwedalonom.weebly.com/uploads/1/3/5/3/135325023/111173.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/how_to_buy_a_digital_camera_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Xw5ijjg/ryder_dentist_cherokee_iowa.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/15262892394.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/YLC6fj8/71888065042.pdfIn PDF document text
    • http://baderakavakuf.22web.org/xizeboxogusuva.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/agfehdC/warband_companions_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/icaTbig/ball_balance_game_online.pdfIn PDF document text
    • http://jamidufabe.iblogger.org/australian_english_dictionary_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/idUXage/formula_1_drive_to_survive_season_2_cast.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/7252432.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/9idiijc/zonivunaperig.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/8f0f2b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/compact_showtime_rotisserie_and_bbq_oven_accessories.pdfIn PDF document text
    • http://jimarol.myartsonline.com/how_do_you_turn_off_mac_wireless_keyboard.pdfIn PDF document text
    • http://suwulinivez.rf.gd/mowowegediwiteligasaxinuw.pdfIn PDF document text
    • http://tulifal.onlinewebshop.net/how_to_play_havana_on_trumpet_notes.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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 4984 bytes
SHA-256: e0655a39532a20e568657789868d9a58d6f6b9b51788df623d358e46ff0d34ab
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 12288 bytes
SHA-256: 6871edb8bb1b5de2a170d091b570f69b0ede66b536d75ba6dec34684fd0484d6