Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3cd6de4320d35f…

MALICIOUS

PDF

73.7 KB Created: 2021-03-18 17:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 795160adaa6dc7099723c9da809dc5b3 SHA-1: 3db02befd6262257e68e9005b7f1de52997ed9d8 SHA-256: 2c3cd6de4320d35f8dbaed6c5d8415713ad52575958b662f2e797b24543fd7fa
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing a large number of embedded links, many of which point to disposable domains or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://crophysi.ru/wix?keyword=fifth+edition+monster+manual In PDF document text
    • https://cdn.sqhk.co/kinemefuwa/RKhhKmQ/english_to_spanish_translation_voice_activated.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/41895857118bx2zj.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/jBhgA9a/nimbus_screenshot_screen_video_recorder.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuwozelob/Yje1vGu/game_voice_chat_application.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/9922789.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/a4Ahiie/boeing_747_supertanker_fighting_california_fires.pdfIn PDF document text
    • http://meetchat.space/bachelor_of_information_technology_computer_scienceih3eg.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/204189baa6.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/faaab589-d0a9-43ba-803e-92b364b89d6a/netgear_wn_3000_rp_handleiding.pdfIn PDF document text
    • http://sujawusoxenum.rf.gd/avi_to_mp4_converter_mac_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ee3773-5e8b-489d-8f8a-4fa3eda45d58/wd_my_cloud_lost_password.pdfIn PDF document text
    • http://wexaxota.epizy.com/sinixatepatajisodewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d312f4ef-bf69-49e3-9050-b86b71b3c617/bekodebaraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298fdcc2-3c1f-480c-bc73-0cb333e06f68/red_rising_movie_trailer.pdfIn PDF document text
    • http://riwinagav.rf.gd/sizokax.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5104 bytes
SHA-256: d44f65d859b71d42ecebab4feb3eeca69c162b0bf9f940e6632df000680f914d
font_01_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 11300 bytes
SHA-256: ad3958eddc83cb898ba13fe0278ad2e8245afc1db6316f7e436fcae3d6af2485

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