Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6edc32576770df…

MALICIOUS

PDF

172.4 KB Created: 2021-03-18 14:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bd2cc34c1e5965c47c65eb3e145657a4 SHA-1: c556c8b000174d943c6d4fc14150a7a36e2831bd SHA-256: 8b6edc32576770df0ca11f97150d1385a4fda3599b988a418313e2c043b645ae
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, forming a link farm. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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 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://crophysi.ru/wix?keyword=biology+life+on+earth+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5fc731c9ba7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/liralimujote/hinhagi/43572305785.pdfIn PDF document text
    • http://mivukiwoluwuj.iblogger.org/mozart_lacrimosa_requiem_piano_sheet_music.pdfIn PDF document text
    • http://vasezasu.22web.org/abcd_movie_all_mp4_video_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/ighj6Id/37797111246.pdfIn PDF document text
    • https://cdn.sqhk.co/jonosefo/ifSDjhQ/carpenter_full_album.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/T9Iu0k9/62207289291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fd071928f217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479923/normal_5fec0023d612c.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/jgjgnA1/cracked_apk_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_5fdbc0bb6ded2.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/TiedHan/sinavanilir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5fdde1af0d632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_602736e3e4ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5fdea180408ed.pdfIn PDF document text
    • http://medakijizu.22web.org/86773638637.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/ge6RgcF/wagejakijifuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_5ff7752ebcd11.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/jsicggt/secure_folder_free_download_full_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedilipabowarad.rf.gd/billboard_music_awards_2019_performance_schedule.pdfIn PDF document text
    • http://marivugedada.epizy.com/icsee_for_windows.pdfIn PDF document text
    • http://rimiboxumexif.epizy.com/52911501164.pdfIn PDF document text
    • http://gokozir.rf.gd/paint_by_numbers.pdfIn PDF document text
    • http://duzifamu.epizy.com/98895266131.pdfIn PDF document text
    • http://xibubixina.epizy.com/99_names_of_allah_with_meaning_in_roman_english.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_off000266e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266E8 5276 bytes
SHA-256: 0bbbd80f5daafdfb582a4bd2a1266acba8f392548a94d450441c0a87ffc69e77
font_01_sfnt_off000278e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278E2 12964 bytes
SHA-256: 8d3fef675331aa5405aadce56eaaabde84fbbd65e296204f1bee961f34e7cdd2