Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf7bfeb0ffdb8bf…

MALICIOUS

PDF

88.5 KB Created: 2021-09-11 18:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0cde0c849ab5c2c0dff19902739290ca SHA-1: 8c2e422f8a2e06c1ae09fd38ecab63817f900188 SHA-256: bcf7bfeb0ffdb8bffbe8c9a7b15ec84d9c9ab794542843e84692acd3abffbf08
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs indicate it's likely used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://krisoc.ru/uplcv?utm_term=beginning+node+js+pdf PDF link annotation
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gowusagerujepidorur.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/26024359792.pdfIn PDF document text
    • http://zamgph.com/uploads/file/011307529686.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wavisuruxozunufipuwi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/81d5a232a7f3f2ed138bc7010724e9b0/32424285752.pdfIn PDF document text
    • http://www.grifin.sk/files/87715586599.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fipapenimipimaxuwogoxare.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021961946233490.pdfIn PDF document text
    • http://hzqzg.com/d/files/sukito.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/51533014457.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/misapirezufasatogefeboxut.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/26282431460.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/77136425539.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/10499564515.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/jamirinewu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/59274821405.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/93314676213.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/10654676096.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910125333.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/bosedijerumabozufupu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332b94b6942---88222861209.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pawigisololixe.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/redisarokapiligisuledimax.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/jejajozavifupawetej.pdfIn PDF document text
    • https://ahha.az/userfiles/file/kusogogomiru.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/8739438095.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_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10448 bytes
SHA-256: 23ffadf0524bd5cdf99dffb761c2214e80c06b29558798507b6fbedeac83af0f
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 17652 bytes
SHA-256: 68c620d3c56b54608496ee9741b541273f26fec38eb8926dbb95f9eb754d76a1
font_02_sfnt_off00013bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1