Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8004622eaf7b2b…

MALICIOUS

PDF

87.5 KB Created: 2021-03-31 13:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3a071fefb23538ef7c2e07b9f7b2d0f SHA-1: ceda5245c6344f018eff52d2e5cf624c270ee29f SHA-256: be8004622eaf7b2b1301aac79e0855b0d1f166f862e64faeee5ceb61aef586fd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://lozipotod.ru/wix?keyword=greska+tibiofemoral+rotation PDF link annotation
    • http://formblckr1.xyz/24532291482zgci3.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/1402915.pdfIn PDF document text
    • http://uscreditcheck.info/what_is_coding_in_the_computer_science_arenahmrqt.pdfIn PDF document text
    • http://crispyset.online/yo_kai_watch_the_movie_full_movie_english_downloadc8kqm.pdfIn PDF document text
    • http://varnisvakq.ru/building_maintenance_technician_test_questions_and_answers81a8f.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/bovusugaxubano.pdfIn PDF document text
    • http://vk-settings-change.online/remove_ice_maker_kenmore_refrigeratore4qok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_2e9f06ba9a664f428eba1636ac492995.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_dce5d0e489ca418486f83452756de6c7.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_dd47ccf60ac14585894cb8accd65ca3a.pdf?index=trueIn PDF document text
    • http://kiroxivox.epizy.com/baadshaho_movie_sd_movies_point.pdfIn PDF document text
    • http://vejawojifig.epizy.com/formacion_de_los_enlaces_de_carbono.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_0134563bd14949dd866b0a1140f45fde.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_39666a6d32a04321b8ace6e7943f3834.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_8fea9249d045492f9f94f705ecbe914e.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_be8339c77fa64161ac6560186c9eac74.pdf?index=trueIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_bc66416768714e8395eeed2e9c8e773d.pdf?index=trueIn PDF document text
    • http://vosimamasi.epizy.com/american_history_book_for_middle_school.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_cc31722d4e194342b62c1617d19f23fd.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_34cfe55502764449bffc932a6bf078c6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 4936 bytes
SHA-256: f70d78814714bdb520d9033643ad2dc38221ee10dd11cd59c66c94095e987095
font_01_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 10736 bytes
SHA-256: 19ce2ccb2390a0924c59eeacab5c59504edb39a4e0c1f94fd1a437c0afdd9bcd
font_02_sfnt_off00014217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361