Malicious PDF — malware analysis report

Static analysis result for SHA-256 646dedf068c8db28…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 03:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8b7b78c61ab6e15ac9a11664ff8698f SHA-1: 1f2a1f21f4110248f33b7cedf979ce461a1197fd SHA-256: 646dedf068c8db28b9ceb43a07d2db72654af2e30671051b6f974838c0e0815a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=how+to+create+new+play+store+account PDF link annotation
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/pazusobonavabewimebemegi.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/24014788150.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/71064906075.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/24096000496.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/54267579877.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/91180538148.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tofojolepenivuvumirasaw.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907192708.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lepitozutudinafinowa.pdfIn PDF document text
    • http://micruts.org/userfiles/file/jodipibiteduje.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/70737485587.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/82695098958.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/tizupina.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/mabowepufakifowemu.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/gagibavegorikozap.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/24370014885.pdfIn PDF document text
    • https://computerzone.pk/file/75209974414.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/girejazuwegevuzol.pdfIn PDF document text
    • https://istanajp2.com/contents/files/21993473551.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/xezosobufabino.pdfIn PDF document text
    • http://vo23.ru/upload/file/58499078146.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/5242348730.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/21785058737.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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 10568 bytes
SHA-256: 69dfbc653374e24c7ed016145fa6f00d708af3ebe393b05bad798d96140b8d6a
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 18112 bytes
SHA-256: dda5d4e16d2a26a28ab2a95d02bc3d0a8b8b6f5ecd77a52c704b62be3bcdeab7
font_02_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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