Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78956d365e202fc…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 14:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecdaf2be4f80ab058c70ae02113ce445 SHA-1: 9f0147dbfde25917fbe576e0d7d53d00e9de80fe SHA-256: b78956d365e202fcae43fdd9494d516fced3efb4b50241f4ccd842f3cef85124
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to potentially harmful content. The embedded URLs suggest a phishing or scam attempt, masquerading as a free PDF download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=how+to+read+the+akashic+records+free+pdf
    • http://7gusevshop.space/calculus_gilbert_strang_answers6iptg.pdf
    • http://gelchlen.fun/161158832185g145.pdf
    • http://boomua.site/fasifavujufenewm6xc4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuwenoxuzasila/biguxuzomovor.pdf
    • http://wagadepepixapu.epizy.com/2017_printable_monthly_calendar_template.pdf
    • http://gepafelixadu.onlinewebshop.net/acca_f9_2020.pdf
    • https://s3.amazonaws.com/lososimap/age_of_empires_ii_the_forgotten.pdf
    • http://ximagutetala.epizy.com/supraventricular_arrhythmia.pdf
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_86248d5745114aa9aaa186c2d27abe53.pdf?index=true
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_f31e64700e834dd2b10ae0334af4aa89.pdf?index=true
    • http://ziwawadu.rf.gd/anchor_bar_wing_sauce_nutritional_information.pdf
    • https://s3.amazonaws.com/nowonovege/1247062908.pdf
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_26c0e3163a274738954875064cfda2ba.pdf?index=true
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_971e54debb5842eaa650a9260efd38c3.pdf?index=true
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_d1a26b53fe7e46c1b3167d4c7bc750f2.pdf?index=true
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_39ecc7815ff94c02aefb56a80f05bcc7.pdf?index=true
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_7fd34683819f43a8bc8903a4a8104624.pdf?index=true
    • https://s3.amazonaws.com/naxizugenabi/cisco_2140_firepower_datasheet.pdf
    • http://sadozejeko.myartsonline.com/purosisur.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin
1a37fde03380dcf3a581c0f9376337e699c9b8868830871f5e1c766baf9739c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5328 bytes
font_01_sfnt_off000104be.bin
612e85377fc6d42328a8079f1d473efbf24e9f12442ecfb4f1262ac9f5479f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10324 bytes

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