Malicious PDF — malware analysis report

Static analysis result for SHA-256 257432d40de7a0e5…

MALICIOUS

PDF

86.7 KB Created: 2021-05-16 04:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50cd8ea7fb152f8259c494a79502878b SHA-1: 91519a07ac8d645c7fad0549aae273ed1120dddf SHA-256: 257432d40de7a0e52454d22293c610269bd61092441d707a1b56755e2b5fd10f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large farm of external links, many pointing to disposable domains, suggesting a phishing or SEO spam campaign. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be redirecting users to potentially malicious content via the extensive link farm.

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://bologen.ru/strik?utm_term=how+to+draw+a+girl+on+procreate PDF link annotation
    • http://nuveclovet.xyz/how_to_take_a_sunrise_picturehs5uc.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/AcjiGIb/33592126936.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/jaOgiib/50516384162.pdfIn PDF document text
    • http://pogadai.xyz/pirates_of_the_caribbean_viola_sheet_musicm6p4e.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/hgi89hi/mod_pizza_delivery_doordash.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/cZUjbA6/find_my_phone_find_my_lost_device_manager.pdfIn PDF document text
    • https://roxadaxakisa.weebly.com/uploads/1/3/1/4/131437443/5899986.pdfIn PDF document text
    • http://dronextactical.xyz/foosball_winner_rulestplbu.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/zgiNgzQ/sivuxumi.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/bhfifgj/star_wars_racing_game_switch.pdfIn PDF document text
    • http://udilische.club/baal_veer_title_song_video8heln.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/gixekumanuven-wadanuforus.pdfIn PDF document text
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/48917049.pdfIn PDF document text
    • http://yourbigdick.space/ashokan_farewell_tabsvo9v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_5e52deab22b444efac047b556092b595.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_fcd832e314cf4c8bbcb42ad7f7a7644e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4434c0c7-dc40-438e-b410-b95c0b9b857a/escort_passport_8500_x50_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cbc9ca-06f3-4609-983c-f9a806a41b32/arris_dg1670a_advanced_login.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_3ca5ff7fe5ba4a52bec4a3b90c9ba890.pdf?index=trueIn PDF document text
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_a05ad32016d445d9a68b1547768c6027.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45368670-ddfd-4ef7-aa7e-5e9ca3aed14d/93010758574.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_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 5116 bytes
SHA-256: 02f92b59b3a02ee1e993e921a12202290067a201c7f07b52dd20ebe5bc808553
font_01_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 21892 bytes
SHA-256: 6b50df66acbdfc07b411af87e405bf1246f0848ea416b38c146549f04e86909d