Malicious PDF — malware analysis report

Static analysis result for SHA-256 e815eec7fd1f3c5f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 14:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4b3013b993b2d2aafba920ab8496aef1 SHA-1: 21320f392b160f86417818ee12be6f7da83cfa3d SHA-256: e815eec7fd1f3c5f8aea75a78756ec9446353a7e2ca8ec91fef5abf979ba5a18
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://soxebez.ru/123?utm_term=percentage+of+water+in+human+body+pdf', is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is designed to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=percentage+of+water+in+human+body+pdf PDF link annotation
    • https://watubozez.weebly.com/uploads/1/3/5/3/135346011/7c2d7114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_5fdaabbb91e0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379035/normal_5fc7493edf915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fe71803cc3e7.pdfIn PDF document text
    • http://copyrightsupport-ig.com/brother_printer_mfc_490cw_driver_downloadwmpy6.pdfIn PDF document text
    • http://chambre.xyz/marvel_video_games_ps4_2020atvah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_600c61c3bb6d5.pdfIn PDF document text
    • http://fenellalucynelle.info/sanewobabunimozez92a1j.pdfIn PDF document text
    • http://tabikola.online/how_long_do_rheem_water_heaters_lastfy794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_60384680e8018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60343ced849c1.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/wigobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc740a73041c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/mahatma_gandhi_short_biography_in_hindi.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_065b4b39b17e4f7687888eb60fbb3efa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninazarila/53562321711.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_ed40a81e0f5447b594bbc00e264b5815.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_cff0ec9b4e354b898e5d8094ace0e983.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 5696 bytes
SHA-256: 9f23bb90196c6fd1e0925c0d17687cec8c14a2dca7feb78821b6655ed34fa0af
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 11164 bytes
SHA-256: 45656837c739fc362199174ec7e967bafccd20e8095cf5465b8788b2fbe15dcc

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