Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a16007b79eae18…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 01:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b52b50425613ba24b5dfb8b339d86f1 SHA-1: 541cce32c626ea47f0da33a1390cd0a1dbb55b2a SHA-256: a1a16007b79eae181de25273d9704d81881d02b3733f1159175250383e6d7dc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or link-farming attack pattern. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://daltan.hu/userfiles/file/82932714022.pdf In PDF document text
    • http://rs-entp.com/upload/file/fibuvimulufudironupavor.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/14342996541.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/mimedukesufupuxufawired.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/94051847707.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3aeced06f73bd9e8f67a6da3878e2b3d/26871524790.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/75386688356.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50217221200.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/beral.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/22569365175.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/62449320248.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631397457.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f73f57f1f---19827164075.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supumogofu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/dibegu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/17455782462.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jafodaduvupiteguwokujurem.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/nomufuvepo.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/didowodajakirevokuki.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/padim.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/kapefuxodurifunure.pdfIn PDF document text
    • http://belv.ru/userfiles/file/3303743356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fortnite+on+redmi+9PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 10180 bytes
SHA-256: 1bf7bb7bcc31fbec7c47fbaf65767bd319b8b2c7bf6f232bfceff77c72fafe28
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 19156 bytes
SHA-256: 16fc194b9f89498f8f209e3c028ee11ab7aada1173d81c9b76593835368ac5dc

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