Malicious PDF — malware analysis report

Static analysis result for SHA-256 02160041cb2dbdf4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 19:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e01a9d7ac1be3c8363d0e9daddef881d SHA-1: 73f1b8640a32741e81cc07233638012443f9eca2 SHA-256: 02160041cb2dbdf4b7b6d79946da1794e71d611ab87be978f1102cb081f94c85
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+know+my+number+android PDF link annotation
    • http://edins.net/userData/ebizro_board/file/sapowinosegamoregifu.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/41780219109.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/xoposixowubi.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40384764801.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/27814433351.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/76393ddbdc67624c02848a556d8869d1/4436338613.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/17746430375.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kawalubole.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dimij.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/65586375014.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/nekig.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/retegulajibujanavosufa.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/99397486533.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/98070043375.pdfIn PDF document text
    • http://cloverdiamond.com/file/xotafomadodevexaposek.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/74633889809.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/movigepovawokonitogodiwik.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/botafalanowibudivulo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fuwesoxome.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/31449573650.pdfIn PDF document text
    • https://fond.ru/userfiles/file/jenuj.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/28317182152.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_off0000afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 10716 bytes
SHA-256: 44ca4f9d9609ce16a09458cddb36c4f70767e59525f114b110bac804fc7eeaa1
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 14664 bytes
SHA-256: a4c7818321544cc27e26f48061a80187bc291dc00a929059910aab714ea10210
font_02_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1