Malicious PDF — malware analysis report

Static analysis result for SHA-256 95aced38c1a3f54c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 23:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7c01c4e809f2402a6f8aed7b92ffff3 SHA-1: 53e44e20454835c7a4e70337a9cd0342ca5f2927 SHA-256: 95aced38c1a3f54c90f8a2bcb941173a69c5fe4e4d7fccd1905752e387c6f548
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stradatextiles.com/upload/ckfinder/files/14695894950.pdf
    • http://acelybio.com/upload/files/xifuwanabibu.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/juriribeg.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.pdf
    • http://kommunikator.nu/demo/userfiles/file///75617063888.pdf
    • https://digireg.ru/upload/zevira.pdf
    • http://sbnjl.com/userfiles/files/63459750801.pdf
    • http://relaxzenter.com/uploads/files/jaguwunaxeribatevuvekare.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/guwewop.pdf
    • https://subded.org/userfiles/file/menorakugisaroredapujut.pdf
    • http://atdawnwelift.com/userfiles/file/supomubageruvotixina.pdf
    • http://geologocarmignani.com/userfiles/files/kepikepexupixo.pdf
    • http://caerulumpharma.com/upload/files/jikutimitiwiru.pdf
    • https://guptajimarriagebureau.com/userfiles/file/98524267461.pdf
    • http://abwplazaview.com/uploads/files/20655584187.pdf
    • https://casabresciani.it/uploads/file/xirijaforodovunokodoviw.pdf
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/90304001011.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7a93ef56ff913d0925b147b28e8fe7db/82086253351.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e6edda8---jojigoxorojijorivogajex.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/94495848478.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/24897864874.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwiwijusuvijosivifu.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/kolokejodinegepotikuf.pdf
    • https://kenhquangcao.vn/uploads/files/41178973484.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+problem+in+play+store
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 16792 bytes
font_01_sfnt_off0000e71e.bin
5d8b119f4acc70296514c941af82da28e06646ba44d9d29ae7ff95ab7ce44e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 16872 bytes
font_02_sfnt_off000112c2.bin
77a76a7bc687095b2b799676e21abf1c62d3003f94bab56551b06c402559cb41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 10896 bytes

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