Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2ed5b0d3ef7122…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 04:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 186bc1256fdac594d97e7b69d7c6427b SHA-1: 0449c5f9f8dc4dc2337e3c3cee259b8f6c750274 SHA-256: 1b2ed5b0d3ef71225d063cb4dadfd6fc97b9693d9ea1ce6909181a23c8326810
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or SEO poisoning attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://duhochoangthanh.com/upload/files/43474392037.pdf In PDF document text
    • http://kor-ra.ru/UserFiles/file/joselefebeni.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/zuxofuruleli.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/zejuranopebaropuv.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/katoxox.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/nitaleguxesedu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161347410707ff---tofewewokupadi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/kijeboronuvapasup.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/88012050043.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/gejaviruwaxusiwide.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/15466158199.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/7781870505.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/82848819626.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/zutimasotukal.pdfIn PDF document text
    • http://synphabase.ch/upload/file/21750441128.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78461365921.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tozepuwupaxa.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gubuzuradiga.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/fevajosebiv.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/japitijorinelijoridoledo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/27214648326.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/26025458936.pdfIn PDF document text
    • http://muszempilla.com/files/file/vuvinurotaminaminegufur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+7+super+lite+x64PDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10800 bytes
SHA-256: 72184fb7d15613d245aed5b6cfb7ed190d4060b0a0b7266f11c5849420af88c5
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 17916 bytes
SHA-256: 334dcc77b05f71453075d06a16edce32eddece15b17d0e64b1f5729091f318f2

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