Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd5fcf5c9683c78…

MALICIOUS

PDF

75.7 KB Created: 2021-05-06 04:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c8c369397d898e5a0e0fa682ff8b5660 SHA-1: 74b2a47006d93df604be086e3eb03d9cb36c9c8e SHA-256: 0bd5fcf5c9683c78e3099e3258d4725fd5b94fc3ae8e226514b8bc81419dedbf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it is part of a link farm designed to direct users to potentially malicious websites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further corroborate the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=custom+air+force+1+womens+butterfly PDF link annotation
    • https://cdn.sqhk.co/befozaxulot/sgCiehg/ice_cream_roll_machine_price_in_philippines.pdfIn PDF document text
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/remojisowelewi-sokekopa-tulilesezere.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/accidentally_in_love_book_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/hbZgTta/bubble_tea_kit_meecha.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/9875738.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/Qxib4gj/mob_xp_farm_minecraft_1._15.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/9Mhdhju/13903687045.pdfIn PDF document text
    • http://uchebnoe.website/rokanugufovobutikuvoxnkmy.pdfIn PDF document text
    • http://study-english-04.space/womens_formal_dresses_with_pocketsp1v2d.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/letoxerutuwen.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/ANjbgeh/emulator_ps1_pc_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/vjhhgdK/cnc_tool_changer_types.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoxezoza/hihJQjc/princess_run_to_temple_apk_download.pdfIn PDF document text
    • http://thefortykuti.com/mariage_d_amour_davidson5fvr6.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/hPheZje/bawuki.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxigu/hfigvjg/23403478793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wetevali/wulanuzosop.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/final_fantasy_12_cuchulainn_guide.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/britax_frontier_85_cover_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/73713252258.pdfIn PDF document text
    • http://litorow.myartsonline.com/english_verb_list_with_spanish_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/419774795.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/writing_with_power_elbow.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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 5320 bytes
SHA-256: ceda888bc0a76397d9a7eaa7e619a8443eb28fda2a323c6864e6341006e2f007
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 10464 bytes
SHA-256: aee473d700432113c7bc73ffa10eea7960259e08fe085afba96467345575d439

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