Malicious PDF — malware analysis report

Static analysis result for SHA-256 eada1335c7bcd108…

MALICIOUS

PDF

101.5 KB Created: 2021-06-01 18:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 02105f61c6525a48581894c81d62a098 SHA-1: 7305cb755e0fa72ad440600d68c8b83145d4de3b SHA-256: eada1335c7bcd10856e69548e04a69de5193a2f3ab9701ed8459cc58f2ddbdac
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/pbw?utm_term=what+are+the+main+characteristics+of+bacteria+and+archaea+quizlet PDF link annotation
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/7843916.pdfIn PDF document text
    • https://lisijinawap.weebly.com/uploads/1/3/4/7/134740049/vawofisilegazik.pdfIn PDF document text
    • https://velolabojenap.weebly.com/uploads/1/3/4/5/134525374/9576871.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/7846402.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/zexosozi.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/bekakex.pdfIn PDF document text
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/0b00f4abc8.pdfIn PDF document text
    • https://xofadasuvakijo.weebly.com/uploads/1/3/4/5/134587438/e8bd4a.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/d0a5434b6a1b5.pdfIn PDF document text
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/6700710.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/lalusakor.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/301b08604c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/f/python_machine_learning_sebastian_raschka_review.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/98938601343.pdfIn PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144446007/18177021920.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144422706/funelopidejiwewuzovaxow.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144420024/rerelok.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416472/bumelasumetijekison.pdfIn 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_off00015082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15082 5592 bytes
SHA-256: a5a0e35981ca7d911f3ce7eca7d6a8d05b3ddd9935a61cbf53e9e4bf2b31aa2f
font_01_sfnt_off00016366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16366 10648 bytes
SHA-256: 9ce809e6e6749e20423e07cd028836677822648f88f017ffb93e4c5d4af921d8

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