Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e37aca4138deb54…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 01:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9c38379402762d2c8d8d08f63145e140 SHA-1: a191b944fef5d0738ce71ef16e6b65fd75a860ac SHA-256: 3e37aca4138deb54f6543f79c71aee7dafaf77bb32564e554eb3a6fe1b6d5934
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to disposable domains. The embedded URLs and the PDF's structure suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mkngsp.ru/upload/files/39824640617.pdf In PDF document text
    • http://divorcefinance.nl/uploads/file/xisev.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/24651984098.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/suzufibuxa.pdfIn PDF document text
    • http://gr-chem.com/upload/files/50576371332.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bfc77d7281e4a0193d5183eb204ebeab/muvidotol.pdfIn PDF document text
    • http://ruihuitax.com/files/file/pojemikika.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/nowowikagumatevelugojotav.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109121151407977.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nigidesoforafoxokuvisixuf.pdfIn PDF document text
    • https://masihpt2.com/contents/files/48400559414.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxufuvamaxu.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/14287436160.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/18346608660.pdfIn PDF document text
    • http://leskovec.eu/files/file/novuroluzip.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090502190722318.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/javapived.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/25070861043.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/sewujam.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/22421689279.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/fuvizegifotubepuno.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kekitoped.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/ramegekijopovures.pdfIn PDF document text
    • http://benrassam.com/uploads/files/80527992402.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/371217939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=melacak+hp+android+yg+hilangPDF 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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 10724 bytes
SHA-256: 1e8e43d7794bc687b9bdb18a6b4b079ba655700e157841ce0d415f96d127ea77
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 17892 bytes
SHA-256: 9f26153b1ee8470bffce7ad373d7c9e8e3094a2c81761c594b9650b78b197419
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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