Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32516cbc60ee378…

MALICIOUS

PDF

92.3 KB Created: 2021-04-17 16:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 755846a53edfc66fbdf478b725ce8b26 SHA-1: 219b75e55746d1811f7c22573c32f937589d667b SHA-256: a32516cbc60ee378c8cea9ca421841511e7e0c9d934994cf5ae9f6c77b29d9d9
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 pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://vilenefex.ru/strik?utm_term=how+to+use+external+webcam+windows+10 PDF link annotation
    • https://wawulawad.weebly.com/uploads/1/3/4/8/134872625/wemuxininobu-vakaxikefese-wasosaliwibedax-rovakaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/igjdihP/movie_box_app_download_ios_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/5YjbheN/diversification_meaning_economics.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/LKJdgge/45216672910.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jfihmvg/battle_simulator_free_online.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/jovorubopezije_demujotafex_buliridu_jizibelovef.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/hau3icz/orange_balls_on_my_sushi.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/sofug-zetapoguba-mosoginepib.pdfIn PDF document text
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/53333208e8b3f.pdfIn PDF document text
    • https://fozonened.weebly.com/uploads/1/3/5/3/135326763/a924a4acb1.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/b3nc6vP/piano_keys_game_online_free.pdfIn PDF document text
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/gogaxif_renijat_ralumupimek_piwazugilo.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/9hbicjd/baltimore_ravens_injury_report_for_week_3.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/knjdhi3/vejuberotemasanazifemef.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/mofixe-lebejexu-fivijofilukixej-bijazinarepaker.pdfIn PDF document text
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/rewufanevosopan.pdfIn PDF document text
    • https://juvarefuj.weebly.com/uploads/1/3/1/3/131398009/ff6c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/ojgcKFE/super_crafting_and_building_2020_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomakobez/61366383923.pdfIn PDF document text
    • http://dakawat.epizy.com/interinstitutional_style_guide_publications_office.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/nidevopuzubuke.pdfIn PDF document text
    • http://wufijimo.rf.gd/jamokamokuvimaguna.pdfIn PDF document text
    • http://wujuxupizosafe.rf.gd/botijeso.pdfIn PDF document text
    • http://demuwesax.epizy.com/4964510680.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/hello_print_business_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/pomukixupixagelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/wills_eye_reviews.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 5540 bytes
SHA-256: 6098cb607aaf610b2b8f8bb3f0fca8b6237479eef061cc9a7f553cd8d0bfaed4
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 6636 bytes
SHA-256: 6022ffafe5af6e73fa44676f8c360d798710653900084599675d4e1c6132e302
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 10480 bytes
SHA-256: dae35dd1726b72418618cf319deaf955b6316361ec8d709de75f4c83e321ee53
font_03_sfnt_off00014daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAF 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940