Malicious PDF — malware analysis report

Static analysis result for SHA-256 93526d646ea1f634…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 14:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fc631e6ad1273529c740e6a05454392 SHA-1: c195425afe56c2cd273a9c718b835ae6af523e85 SHA-256: 93526d646ea1f6346724d49e5b6e830a86d2602ee72ec03e360712906db50e1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination through a large number of distinct, low-reputation hosts. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://hotelindigha.com/FCKeditor/file/711127313.pdf In PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/3660954883.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/21244166033.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bepevorejewoteragezex.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210905231325.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece85970b7---72651581968.pdfIn PDF document text
    • https://mediaskills.rs/files/jonig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ebb0e9f6---83450284709.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/pirapusuwulamavun.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/xaribepobofamovibopulilag.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/fiwavegapipapevu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/62700029689.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/11635980029.pdfIn PDF document text
    • https://ever-progress.com/upload/files/wuretowifivewubo.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/90467406072.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/62938063612.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/96456568489.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/31728270097.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/momonexedafidebodumetatu.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/96945793906.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/sepunabenedazuda.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/46970069004.pdfIn PDF document text
    • http://home-plast.ru/foto/files/88676495642.pdfIn PDF document text
    • http://sayarbobinaj.com/file/geduvidebusutiralawupe.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/72577672661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=11th+season+of+walking+deadPDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 18236 bytes
SHA-256: 750e2cdf5fd5478aee56204beac39fbf6325096ccb753326b8fc14e8edbf75bb
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 10664 bytes
SHA-256: b09469b70009435b4234bacb8c77d2404b1a2254575126ca61d744ca9e4a2e09