Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e05324a1ada75…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 17:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61b7472fa9121b228209a4564931630d SHA-1: 4a44fe76c894b3f58832e419fd4f3c46708af64c SHA-256: f28e05324a1ada751581ffbbba9ef420a08ef44d2189dc29a7811d13eb9709a2
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of multiple disposable hosts and UTM parameters further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://angkaindaman.com/contents/files/sugoxudiwo.pdf In PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/234486284.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xelelimum.pdfIn PDF document text
    • http://micruts.org/userfiles/file/kevakasomefegudexogotax.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141659f78626---35137209526.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/wupiganokarixi.pdfIn PDF document text
    • https://equalland.com/uploads/File/56999312837.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/mamelemanavegiwipika.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/30448029037.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/77265416571.pdfIn PDF document text
    • http://chayka-svg.ru/files/kanasono.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/57036494003.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/savenami.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zuxirawowetoras.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/27075648923.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/futegifaga.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/tadad.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210917095659_54lgse.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/waxur.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a24353874b4d9d80c72807016ec757ae/81481183751.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/zosoxobuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+horror+game+for+android+2020PDF 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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 16884 bytes
SHA-256: 47d604be313d55ca372170c44beba4b079c0e07f43b189a6f98d494125d33605
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 11052 bytes
SHA-256: 489d0f9ea50ec5187c3c19b09adeea4db9d47873a83f02217ecb27386405798c

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