Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfa64663c1a063b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 02:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dd4bdd0ce8dd3cb40226ea8b4cdc2553 SHA-1: 2dcac1ac287c6cd47258acf5881a0e3f7667fe6f SHA-256: cdfa64663c1a063b732e5a1303fcf46e727e05a79018cf57481290bd8ae8c80b
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://generaldistco.com/images/file/likedozigul.pdf In PDF document text
    • https://raselapp.com/userfiles/file/64250925131.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/wefoluk.pdfIn PDF document text
    • https://ptogel2.com/contents/files/9479769643.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/wafiduvogun.pdfIn PDF document text
    • http://www.siposferenc.hu/html/10233620287.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/28004270834.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/detililafilajebuvipele.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93066987565.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/silivevejalibedusiwedus.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/giwomikilum.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/159323853.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904015617781164.pdfIn PDF document text
    • http://iscelenie.info/files/file/50276251907.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/pukaxinodepiwavulij.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/fezowifat.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/487770577.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/93910286570.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/bewemefamepenivoxunakun.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/1186791011.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/zanibakirumiwikamoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reset+android+phone+when+it+is+lockedPDF 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 17620 bytes
SHA-256: 90a7d6bab86d3a47e1a3d37c2f647effffdeb180d6c94bf6fd32c9f66c296126
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 10780 bytes
SHA-256: abd89d6f528789e0caff8395d0952c043c488387a15ea60f4226af5bad3c7cb5

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