Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7e7b642bce583b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 14:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d536b8aaccd0e4ee69047b33016bf15 SHA-1: 6f1ea3d35986d96c336de4ca4e7c2fb8a271696f SHA-256: 6d7e7b642bce583b2713239edc47a7733190138f4f030d6287d6b945e0ab0795
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or a distribution point for malicious content. The PDF structure and embedded links point towards a phishing or malware delivery campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=android+basic+examples+for+beginners PDF link annotation
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/19969606239.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b626cbb---sefujomafufarow.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/6861390240.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/40601467293.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210918_CC2CB18B35833B46.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/21985719916.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/60550664055.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/44392264409.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/mitejerefinopoxuwidajas.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/59825825106.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nerurupuzojizekuduwinejuj.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/widimusijakojo.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109191003185526.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/75271798712.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/34714959993.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/46293885122.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gomibogopafokudelosu.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pexomitosileruso.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/86445380352.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b518518b---pedupakutemedabonavop.pdfIn PDF document text
    • http://vlajamo.cz/images/file/97292058165.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/limuzufuleta.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/40573830661.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/xugovimimab.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/96533138336.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/73173452251.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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 11088 bytes
SHA-256: 13ba74674f8dc5da55d84b2bf8bf2f70e46220cfd8962496110d185823541dfc
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 17876 bytes
SHA-256: 8b155795e0a6120d368ca01a4945d19a3b31f5054f0636b9641c88f19b5b0c0d