Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c71eb88243ce312…

MALICIOUS

PDF

70.4 KB Created: 2021-03-15 04:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 963b7e88bfe61d9b8b4debf076ea2bae SHA-1: 95de2a302762065be835eca81b5a100c611d7929 SHA-256: 5c71eb88243ce3127f04a363c15996acfdee0e809c6b062ef849c908c822a4ae
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to a product listing, likely a lure to direct users to malicious URLs.

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://fokemale.ru/strik?utm_term=rii+i8%252B+plus+mini+wireless+backlit+keyboard PDF link annotation
    • https://cdn.sqhk.co/tejilunuf/eMiieuS/60380229531.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/ice32v7/punebugefi.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/aadmtif/lutamomowexeduj.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/ntyibD6/google_stadia_promo_code_uk.pdfIn PDF document text
    • http://sawuzelipo.iblogger.org/97879731724.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/gj0iaIc/13023887540.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/fhfifhj/do_it_yourself_electronic_projects_kits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_7f06be35030a43d79ba139eebdd30420.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_5e9b96e115d54cfaac0d56caea7a32df.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_49169982fb76441baca3cac0ffb5c32e.pdf?index=trueIn PDF document text
    • http://rifovedukuj.epizy.com/72523954268.pdfIn PDF document text
    • http://gapuxekoxegibeb.epizy.com/fufubatezugigebevufapel.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_b3f5354473584152a1492638d8301acc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7838097c-a384-4702-bec4-86249ace8691/22800851655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ca6141-e2c2-44f6-8cb0-63f6130138e8/hoover_floormate_deluxe_hard_floor_cleaner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddd95b9-84af-41ac-acee-3e897eee344b/how_to_find_distance_and_displacement_on_a_position_time_graph.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_9f839eb3a1fa48a182a3d44693f71e8b.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_71bbc427e946455285fbeda4949080d4.pdf?index=trueIn PDF document text
    • http://nasutewu.epizy.com/ccna_certification_exam_questions.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/39484271610.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_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 5816 bytes
SHA-256: e576b1316d60e18050bc17e3f841bd974dfd6448408c8fce508d9f90f1d6db46
font_01_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 11632 bytes
SHA-256: 7a654d98680ee2fbe2ef2e63b776e0bb5c6f3cb9e4451e46376f3820e20e3532