Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14c473f4395d30f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-31 20:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab2ae5cf3a91644540dc466e0a849176 SHA-1: 7dc1178045fc4723bc8a4ea07c0761e3e338c688 SHA-256: c14c473f4395d30fb8ce8313ea94b1a8da0c507e9acc38bf2ded3312423a05d7
226 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, suggesting a link farm or SEO poisoning tactic. The 'Remote-support tool lure' heuristic indicates the document's content likely directs users to install or connect with remote support software, a common pretext for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://vilenefex.ru/strik?utm_term=my+favourite+pet+essay+for+class+2 PDF link annotation
    • http://nesorus.mywebcommunity.org/farmall_h_carburetor_parts_list.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/jdUSicl/terosavurejam.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/91795556769.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/jfDxCk6/jakumalitikegatenevexeg.pdfIn PDF document text
    • http://tazijiga.22web.org/bending_allowance_calculation_for_sheet_metal.pdfIn PDF document text
    • https://pifeposanitu.weebly.com/uploads/1/3/4/7/134753567/wurukubinomivuve.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/3jirid3/snapchat_logo_white.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/571243.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/12644630829.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/gjbhg8g/carer_allowance_medical_form_under_16.pdfIn PDF document text
    • http://fewizoge.22web.org/xitesajuritupixodunubilu.pdfIn PDF document text
    • https://zoroxazug.weebly.com/uploads/1/3/4/6/134614170/79b209.pdfIn PDF document text
    • https://betutemibo.weebly.com/uploads/1/3/1/4/131453998/964aa1fe3d.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/XjeqCib/good_workouts_to_get_in_shape_fast.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/what_are_the_components_of_mise-en-scene.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/26485434835.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hbiiwic/rijubirenedej.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/wuzizaxofeki.pdfIn PDF document text
    • https://cdn.sqhk.co/muzipajat/rt1jchd/brightstar_tv_guide.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/5e2d5fbc-b215-4920-b45d-fea74441a474/mukaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7086e175-9778-4d4c-abd1-8b3ff42d26cb/what_is_hardware_software_integration_testing.pdfIn PDF document text
    • http://folujas.epizy.com/kifopanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ac6d99-7a37-482f-8b0b-a5a72413c77f/gevesefaxikin.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/emulator_android_untuk_pc_ringan_untuk_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921ac09d-31f4-44ca-bcee-431ddaf4ce31/bible_commentary_free_download_for_android.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_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 5308 bytes
SHA-256: 3ac399ad01abc9d7bcc09931a331cb830a5e9b6526e31ca1a6943f62dd053979
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 10508 bytes
SHA-256: d6cdd0149d7bd6fc8c9a1fc87fbffd0d4e3d7d58be87bef100f9fce0ff64a06e