Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67c9d31e6af4ee9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 11:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adc7589603f1b36ea546503c5ce65027 SHA-1: e586b4c14c64e8995323d2ed6eb103eb5d929ef2 SHA-256: a67c9d31e6af4ee9bb1b444b3a36faa62a37b9bc4e90cba6a8be189550ed000b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=how+to+open+ics+file+on+android PDF link annotation
    • https://momsgardenfoods.com/ckfinder/userfiles/files/45124203480.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/wenibewibotog.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/99706157521.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/90111544887.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/45606607040.pdfIn PDF document text
    • https://viettrungson.com/media/Files/27614323776.pdfIn PDF document text
    • http://cbstav.cz/file/42110717424.pdfIn PDF document text
    • http://chipgene.com/image/files/20210913_005641.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/45325050720.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_081902.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091913330373499.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/38791131787.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/peniboxogosifabafabapu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0b7ca603a21de09daa5996d7b1f05a58/paguwike.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/32072082897.pdfIn PDF document text
    • http://dgkno.cn/upload/51115452853.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/gagibuvedujukumavotijo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219141116481073.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/31320040499.pdfIn PDF document text
    • https://pindimana.in/uploads/file/puzutomuzekofusebonorulig.pdfIn PDF document text
    • http://consade.com/userfiles/file/lonut.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143fbee5c71f---govadunetasevakel.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/82063727229.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/megezodewenubiju.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fbec66121---85997558809.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/gufoxaviwirewuwawaluwopop.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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 18364 bytes
SHA-256: d83d731c1a36167a5c33c61ce5b063e257e524f42f9b149cd3f082ea40f1a2f0
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 10688 bytes
SHA-256: d08d4bb580a10e741a62c2fc53c2ea5b11bf0738bd0f262b7947e8370266a628