Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b68fc97edc71d5…

MALICIOUS

PDF

88.5 KB Created: 2021-09-18 09:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 815471496b858b088ebf46ef2924755f SHA-1: ae11385e63776fb4228c77eec66c985ba53350d1 SHA-256: 69b68fc97edc71d5d68cde4740986e01bccfa03fd3838498a3ee7a0f61f3b326
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to domains with low reputation or that appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://heldermusic.nl/ckfinder/userfiles/files/67438237351.pdf In PDF document text
    • http://businessvaluationapp.com/fck_files/file/bonase.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/33540697315.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/84872761991.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/78538737285.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/50032112036.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/filel.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/48865737929.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/47421342646.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/vexikaxe.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/linitenixososajem.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/jejowojesusaxadewotunamud.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/57853152508.pdfIn PDF document text
    • https://eklyps.net/images/file/gotuxeziteropavujipu.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/kunilubesig.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/soxiwibijifal.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/kupoxirarokufadegukoz.pdfIn PDF document text
    • http://i-dron.cz/data/file/38703444356.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/wezuguxekules.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/digokupovuto.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ccc2f7f---lemozovimatoradevoxog.pdfIn PDF document text
    • https://pecsikult.hu/files/file/138615234.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xubakinoxomezufekix.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/af36210ac8e25ec3cf0f7a67bc22826c/ximodokibav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+android+car+apps+2020PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 2192 bytes
SHA-256: cfb1580163e84f4efb6b278a67b6d9731dd035c0dfe3fc275b589aeb22e353f6
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 10756 bytes
SHA-256: 9ed29cbe4e8566ef65f96599b7994e3741226703fb5665e55ae8529d603714cf
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 17256 bytes
SHA-256: cc3d7128bb1eeee2345df45613bd2f2c58c4beff0a12dbb7b71f328703ece4b6

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