Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc9366377e67382…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0f523f657bdcc1aa114189724c172bb SHA-1: 72e1b68b259e9ec780d1d3922f8fac2a695c8feb SHA-256: 8fc9366377e673827bd639be3b06a0d93800d45a2347eeef77e374b95fb1c353
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=watch+tv+shows+free+apk PDF link annotation
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/tizelisigez.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba47c6e94---xajera.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/piwasobegokidemexawilo.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/fesuwi.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/5751869247.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/91628309367.pdfIn PDF document text
    • https://tpk-m.ru/files/file/39138576921.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/mudusidigevaza.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/42006918392.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6348781243.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zekusobedemeg.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/96995338904.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/joxujaxumugixebode.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613855d6d122f---zufavugejowotizam.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908063711052946oxd0s.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/97637019947.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/40056628438.pdfIn PDF document text
    • http://saktigroup.in/uploads/31996138387.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zewiraburabolarabare.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/73313729360.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/66924841831.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jexoxasiwidoretutimet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 10572 bytes
SHA-256: f4515f25d8d77e830c74518d66f7052eb5dd8e65f4c25e42b4ee6d5e00ef8a77
font_01_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16404 bytes
SHA-256: cb9261c8b28a08836435583532a204e8603683ccc4c91719168f0b007a56cdf2

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