Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e0b8e8bebc1cdd…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 10:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9cc9745f6a9626dab3d93f51ca02de83 SHA-1: bae71d631adf4d4f4d42b7ccf4ebc4bf42fac486 SHA-256: 38e0b8e8bebc1cddb734ad972b4ac7d152f4272bb873c5a19e75b4bdbf89c71e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to link farms and redirectors, including a critical finding of a link to known malicious redirector infrastructure at 'https://dafemum.ru/award?keyword=fly+me+to+the+moon+ukulele+chords+pdf'. The document body, though heavily obfuscated, suggests a lure related to search results or information retrieval, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=fly+me+to+the+moon+ukulele+chords+pdf In PDF document text
    • https://cdn.sqhk.co/xasakeza/haXXibK/jekanutovifepajat.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/fiKibvJ/99767302300.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/ruzanokura_laviwudona_kupakapipa_rafolifi.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/zdR6Yig/space_agency_game_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/bKsuBhh/sigufokeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/dqu77J8/scent_of_a_woman_tango.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/f35421aef.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/edca1710-f564-4a75-a75e-be299a8093a4/how_do_i_change_the_battery_in_my_accutire_gauge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50418e98-1d7e-4a1a-baf1-39945da3adb3/confessions_of_a_shopaholic_full_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35511715-7689-4e33-91ba-8c5701e49892/how_do_i_write_a_biography_about_myself_example.pdfIn PDF document text
    • http://xojuzovanafugem.rf.gd/lexical_semantics_by_alan_cruse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b5f96e-1c21-44e7-911d-c2d47292b80b/echo_srm-225_weed_wacker_parts.pdfIn PDF document text
    • http://vatujub.rf.gd/zalexigegurasosizomukadof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fb1509-f933-47c8-983f-e4c485057cad/75483430288.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_4718aa676119406c85afe93ba518bc49.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_7e8ca8f737b140bebd5fdf01b1cf1baf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4885a7-a5a3-491c-95ca-ad4cb1253c86/how_to_turn_on_ellipsis_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e23317-9386-456d-acaf-7afcc83088e9/lakare.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a60c3dfd42ab4de89dd210a129049e36.pdf?index=trueIn 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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5304 bytes
SHA-256: 3082a4e6c1f1110dfb20e128b269f17184060e1be9ef5ab82ba6979836f0dd50
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10776 bytes
SHA-256: e20bbfbe9eec2b808be0cecf391882857912c371c1894a0b59babf697e24504f