Malicious PDF — malware analysis report

Static analysis result for SHA-256 1956d8d968e82e3c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 20:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0063377e76fb134494e5ae34b451ed1 SHA-1: 5c74a8e4bc31d319b2da6769594aa2a343c24c76 SHA-256: 1956d8d968e82e3c1166247f6379b9a2df83b8f1e375a598af38535cfd712fea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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://queure.ru/uplcv?utm_term=hill+climb+racing+1+mod+apk+download PDF link annotation
    • http://espaciocultivarte.com/ckfinder/userfiles/files/bexifoxis.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/muris.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/14719457828.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/fovavakubunijuzob.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090504123112.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907170846797.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/tefaroligetubozarawuli.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/xuboziluf.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/sunuzusogute.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/xinifiberupodoruni.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/57235021660.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/rufotutaratobatizizog.pdfIn PDF document text
    • https://artenika.pl/fck/file/49081743696.pdfIn PDF document text
    • http://texmet.pl/userimages/file/lusovonudef.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614184627fba2---noxalonosibidesozid.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/xafon.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/bokikaxawigi.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/mugiwovufadazexofitife.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/61007236346.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/fizilijogifag.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/5879184676.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/42980582087.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wuzatoluxunetuzeb.pdfIn PDF document text
    • http://www.bandungmesin.com/file/17697063169.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/xoxotitu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA53 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 21140 bytes
SHA-256: 4d13c7b8bdd6754470bf8620190b6eb8388fa22f3de7f91244a09f2485760f56
font_02_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 10820 bytes
SHA-256: 266b85d29b00c884550bdc229a7c92a54fbadf121650ace022b809dcdbe7f529