Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e161dd6c5988b1…

MALICIOUS

PDF

78.5 KB Created: 2021-06-07 16:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c7092f25aacaee7807904ab44f1bbe70 SHA-1: 53fbb4f585cb50b9876fa5fe6299b54af5d0887b SHA-256: 74e161dd6c5988b19d7f9fd93e91092eda4eadf70822ea4cf1f4990666e9e131
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting, and a high concentration of links on specific hosts, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of external URIs and the overall structure point towards a phishing attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/pbw?utm_term=borderlands+la+frontera+gloria+anzaldua+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479226/normal_60093e3740400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6014a4feb85a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_606e985be5788.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/89be4779-c087-47ce-8612-210399138798/69433964888.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/15847229743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c44c596-f1ab-47c1-8b20-c2c5345fded1/how_to_make_a_lithium_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cca17f-b37a-4f35-b951-41488b83e8d7/grimm_fairy_tales_character_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b4ece7-bf7e-47d2-a4e6-f7d22c5b86a5/tying_the_knot_book_review.pdfIn PDF document text
    • http://ralogotuxa.pbworks.com/w/file/fetch/144780228/fijep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6105055-f62d-44ce-8d73-6cce237dec73/babasawovipuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af12836-8f01-4824-9e86-30bd89502eb1/35672067955.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/tw_call_recorder_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dadeadf-661c-439b-b378-8f166347d2da/a_dolls_house_summary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c01013-af3b-4ed2-9434-47d822dbaee3/daxunotofeneg.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/riwifapetobatorotex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c331ca01-e3ee-4b6f-8285-a8c1c6c2c2e5/80179291955.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/56720554000.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/count_by_7s_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfc1ca7-5eda-4e9f-b5bf-0676cd167bb4/free_download_terjemahan_kitab_al_umm.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/zaginobetogawok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3e3acc-3f89-40db-87c3-e1e27d5fabc8/petewanawegetibim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb5666b-0b9f-4e17-9559-470043580f8c/vacancies_meaning_in_punjabi.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_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 5308 bytes
SHA-256: 71397d9c1fdea817d111a54b3849e059982711bcb1ad2e8e9856c678f02728c5
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 11620 bytes
SHA-256: eaec3ebfd52c020fc95f9ec06c62842ce8daa207719250c1435b4ff2435fabff