Malicious PDF — malware analysis report

Static analysis result for SHA-256 8898c59d3dc83181…

MALICIOUS

PDF

81.9 KB Created: 2021-10-05 19:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 67fe05423a548ddc676fbf447ea0ddf7 SHA-1: 9145c25087c9466b827fc6387df856d7b67b2cf2 SHA-256: 8898c59d3dc8318193adb28ea585957f7b365927905045aabba743eaf970c0e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are disguised as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into clicking malicious links or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=please+run+the+chkdsk+utility PDF link annotation
    • https://bdblue.com/ckfinder/userfiles/files/19118640352.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/riwupi.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/88979591247.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/kuselowobegufa.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/41514007582.pdfIn PDF document text
    • http://baoveantam.info/upload/files/wegerogev.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/lasutefoduwofavopo.pdfIn PDF document text
    • http://automag.pl/userfiles/file/pewaretowagixipaxa.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/97448252050.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/93353830997.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/gexirokimab.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_121053_803.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/64747118971.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/161513f2846d02---75217557510.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tetuxirijid.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149917910795---mosesegamejevezilimolofi.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/75645767392.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/nilozuseno.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/40196595640.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/kegemafeto.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/majufamujupibijive.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/xuxedesozutopud.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/93388637802.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/wuzepofugewamagofopix.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9ebd65b6---14994848576.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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 18252 bytes
SHA-256: 11bf114522169c21da70ed5739eebc2615b0437e40adf9a12e76bf3a0183d42a
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10652 bytes
SHA-256: 52bd9d5afe06c232ae1d01e9661e8d42ab14ab18312f1aefc4914eef1c8f2fb4