Malicious PDF — malware analysis report

Static analysis result for SHA-256 d836368b68c48640…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0dabbc2d34e8d3917163bff5008d3f2 SHA-1: fa765d20013fd335a01f49fd405b1b90023b2696 SHA-256: d836368b68c486406547d810b35f24d52c7449b982d8a7f6ed6e7a899a820d8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, one of which, 'https://archism.ru/uplcv?utm_term=download+latest+version+of+flash+player+for+android', explicitly suggests a lure for downloading software. The PDF structure and the presence of many links indicate it functions as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=download+latest+version+of+flash+player+for+android PDF link annotation
    • https://bauarch.bg/files/xefutefijanug.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/rojexatokagopitororugifa.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/bovanitonejolala.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/50868016738.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139864129122---9329295583.pdfIn PDF document text
    • http://etkenkalip.com/files/54504961206.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/kodorapikox.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/letanuvevu.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/loxenusenulojizif.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/gopufebojopin.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/66220703617.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lobizapulapulazobo.pdfIn PDF document text
    • http://chemicalengineers.ie/images/98666732899.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/87735489325.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/devanemivafe.pdfIn PDF document text
    • http://metallpress.ru/files/xopadinize.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161319252badcf---zezojatuvebovuposepejak.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090121581598.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/retokibunesujeguxola.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/24907228366.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/12637393580.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/kumavedutolisatomamalanel.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/23783399253.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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 10860 bytes
SHA-256: f0e87588ecb23aaf5234b94d9511c6e1358793573af4b53c03a028187fd197cc
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 14976 bytes
SHA-256: b85c16933a12efd874a3fb6c372dfe067f3021ca14df01ed7b5e103806d3a0df