Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1a7175232ad79c…

MALICIOUS

PDF

99.3 KB Created: 2021-03-30 21:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a35e4cbf8c452abfd4cff604e6cc1a7 SHA-1: 098298c13035a5a2c12fa5c833d244cd163e7626 SHA-256: ba1a7175232ad79c6732d8aae396b435d37ece8adaeaf8dfd02f07946f522bd7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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
  • 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://dafemum.ru/strik?utm_term=what+is+emotional+blackmail+in+a+relationship PDF link annotation
    • https://cdn.sqhk.co/tosilura/iiIRjcx/my_lips_are_sealed_song_in_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/ieFcgex/niravosifukafosapezo.pdfIn PDF document text
    • http://tiktokfrance.fun/tedopuvevatu0ry.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/Iiibghp/pokemon_yellow_gameboy_cheats.pdfIn PDF document text
    • http://upgrade4me.com/project_planning_freewareipi5t.pdfIn PDF document text
    • http://idealicait.site/pulse_point_webhoty5.pdfIn PDF document text
    • http://dk-inc.xyz/altered_carbon_season_1_episode_10y821x.pdfIn PDF document text
    • http://masito.space/9295732245351psh.pdfIn PDF document text
    • http://reliables.ru/motorola_radio_holster_leatherfhsng.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/ViaDMhg/outdoor_basketball_courts_near_chicago.pdfIn PDF document text
    • https://cdn.sqhk.co/zisazege/eSpjhQw/spine_deck_amazon.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/nedabomazosejalipulib.pdfIn PDF document text
    • http://avtoshtorki.shop/how_to_draw_a_realistic_autumn_treend5ix.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/be06d0e4-bd5f-4228-a9e9-1ce716259f07/fituwusowonokavo.pdfIn PDF document text
    • http://sadozejeko.myartsonline.com/bhagavad_gita_chapter_18_slokas_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4172fe5c-862c-41f4-a65d-7f399af01a98/dijexegosuzesajunajot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4889b63a-563a-43aa-acba-dd450670968e/basic_electronics_mini_projects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1ef359-1552-4339-b4f6-1c615ac6ed13/washington_football_team_final_roster_2020.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_off000148cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CC 5392 bytes
SHA-256: 713062e9d699a200bd694d3272f6a659cabb1f0a3a49c150f89d0594c85f7ab3
font_01_sfnt_off00015afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFC 10748 bytes
SHA-256: 81901c4b30871043bd6e8e230401e5f002670ea6e349e6aa78692d46b7cf5b73

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