Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc78079d99f3277…

MALICIOUS

PDF

74.9 KB Created: 2021-06-05 00:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 193b4618209129b70e5f51cf5c68e896 SHA-1: 754362c86466b9c7a04fe104001bd29d192769e7 SHA-256: 7cc78079d99f32777d153317c510c4c636c0ca92572c6c24d252b7472c425eef
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'coretry.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=dil+hai+tumhara+film+ke+gane+dikhayen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381344/normal_60209dc31904b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5ffff5b2498cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_60251f23c8f94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454545/normal_5ff6bd5b834c1.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/3cd54eb5-4781-42a0-9f08-ff3f11fa2619/9244733475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d325e3-88d7-4674-9451-4270e2ac2e5d/stress_relief_tips_for_college_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05179b57-5fcb-4b32-8f7c-5b62573f3bf2/real_easy_book_eb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd3d6a8-4a0f-4969-bf2a-64252f0e087c/2004_dodge_ram_1500_quad_cab.pdfIn PDF document text
    • http://depowota.pbworks.com/f/penguin_tamil_movie_download_in_isaimini_2020.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/w/file/fetch/144567357/66755355232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc607a3-2ad8-4c4b-9a66-70d7a6c65b27/busaroxefubamudupuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d783ddb3-33d8-4b6a-861f-1e260dab7754/25176624608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6295506-8597-4730-9867-e64aa4e9902a/vezaxope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5f4b8b-37d8-4fac-898b-217c291d4677/star_wars_old_republic_how_to_get_cartel_coins.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/tavafedogufezuweketob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45571692-143e-49df-a9fa-0d9631ee2518/52661428089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd81c16-cfe3-4228-b2b8-09972a93e0f6/my_gas_oven_will_not_heat_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8107771f-5b9e-4bf1-bfe4-ac64a9756705/watch_tagalog_movies_online_free_full_movie_no_sign_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10daf15a-867a-46ca-b1fa-7fa16b9f6fe0/70032612085.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144606408/advanced_potion_making_book_cover.pdfIn PDF document text
    • http://saladolu.pbworks.com/f/7.snf_ingilizce_ders_kitab_cevaplar_meb_yaynlar_sayfa_78.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5308 bytes
SHA-256: 690f2c6e79cd43b6e2c8f3ef58c5ee0468c4cffd430a543b8948053175a5eca6
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10760 bytes
SHA-256: 0981c57f09138ad4011ef70262af7b7397db576beefb9d25a7ca5dec9ecd3e6d