Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0148c6313517ac0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 10:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4184527a41c34a3d35b9076ad3ab1e5f SHA-1: 18228119706648e1b8ca229ad6cd4e1c8378353d SHA-256: e0148c6313517ac035443956b674ec1f7bbd36a08bf056d6b056e821b12f7154
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this redirection is for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://househouse.it/userfiles/files/50196934408.pdf In PDF document text
    • https://ptkas.com/kingkong/userfiles/files/1836476121.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/33365171854.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/vevemetejidan.pdfIn PDF document text
    • http://aicpwdosaeast.com/ckfinder/userfiles/files/dubavatazegujezebojif.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/wujivabexufenizoximekisi.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/dolaxexawososoj.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/50138349666.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/pubiguxofadubez.pdfIn PDF document text
    • http://elskenecologie.nl/files/zababod.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/53297391391.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/ruvadanagurila.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-28/20210928141045645553.pdfIn PDF document text
    • http://dsagco.com/Upload/file/78476729239.pdfIn PDF document text
    • http://airsoft1.ro/files/file/27463563109.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/54947362499.pdfIn PDF document text
    • http://birdwatching.sk/media/file/bimosuvabugopuvumaxa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfcm9nibeir4fhg75hdch31ag1/nabawodolivebodon.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/73481837768.pdfIn PDF document text
    • http://jawarakreasi.com/file/73034080411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+hawk+that+dare+not+hunt+by+day+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 19480 bytes
SHA-256: 5824f4f990e2b6e7757fd7bba92f2fa7d7c4182152c00bb6086f326c8c046d3e
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 10784 bytes
SHA-256: bbbf1822e498cc6a179b5f6e4510ccadf370628d95a7dd7611e219cd7ff49504
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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