Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05845fdf7e1c5ed…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 18:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b962a6772dec6b52365e8fccd236d3f7 SHA-1: 997a9270f6c1adffe2689530486aacf6d6bee2e6 SHA-256: a05845fdf7e1c5ed93bc181a46345012a5df9f53bd1dc620797b4b0db0b3ec50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior, and the presence of embedded URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=asphalt+8+old+version+mod+apk PDF link annotation
    • https://universal4shipping.net/userfiles/file/jexemibenegotudejoruw.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/jonis.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109060459199445.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5j7t10lp7ccq8j1sonj0ti6jh/33849283283.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/14235356764.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/wewudu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/nefujanok.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/gonamobefifejixa.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/30707634598.pdfIn PDF document text
    • https://mangallagn.com/images/file/punomuxisizejaruwetosi.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090312160873499.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kanekasibedumugos.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/284235119.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/godosawov.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/58934567873.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/5751525996.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/manasusiwuzumilon.pdfIn PDF document text
    • http://rcmo.ru/upload/files/tubimowiduragedodesogeso.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/87529063018.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/wobirodenujipamu.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/6976536992.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/29050281763.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/44229498168.pdfIn PDF document text
    • http://ipceurope.com/assets/file/97261472582.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/76081402326.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/peginuripanaforitu.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/56510332876.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 18240 bytes
SHA-256: 89c16d05cce5f9826931bd021704c9d25e5c3d329fae70d5277fce30800ad3d2
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 11004 bytes
SHA-256: 6a60e1efeb6761817660ec480d5f124591f5ccbee20f8bcdfcee6e0f042cad16