Malicious PDF — malware analysis report

Static analysis result for SHA-256 290075ae5bb4b099…

MALICIOUS

PDF

159.4 KB Created: 2020-11-07 21:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 29b494f5a66ddddf27ca64c036815c00 SHA-1: ed17b0eec586d2e036dc98ad129498bf8a1bf4f1 SHA-256: 290075ae5bb4b09943cc8fac186a11e769b91378b3edca8effb61cd906420412
164 Risk Score

Malware Insights

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

The PDF contains embedded links and text that mimic a search result for a 'Thermodynamics solution manual pdf 8th'. Heuristics indicate the PDF links to known malicious redirector infrastructure and is part of a link farm on disposable hosting. The document also uses a lure for password-protected archives, suggesting it's intended to deliver a secondary payload that is encrypted to bypass initial security scans. Although no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://traffine.ru/aws?keyword=thermodynamics+solution+manual+pdf+8th In PDF document text
    • https://mupaxeruzu.weebly.com/uploads/1/3/4/5/134597089/ropon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5f8fb5f56a2cb.pdfIn PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/ef89bc.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/kezuzep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_5fa2d4c093fc2.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/5379944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5f94023164e59.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/8b074ba43.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/under_saarthal_puzzle_skyrim.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/saxapasunibunatet.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://zisadetofuge.files.wordpress.com/2020/11/fotak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F443 9344 bytes
SHA-256: b18905dc7817397c3c9a3874d16596cbdb8d08ef81a4916e36eb70e43cbec6f7
font_01_sfnt_off00020e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E6E 2888 bytes
SHA-256: adf32003828e0940dd70a9ab198bdbf787bfce6d516b45b646911e816e1ab742
font_02_sfnt_off000218b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218B6 5640 bytes
SHA-256: a6ae7ee45b28d9eb425d9a1cc819b43cc50ef68cbfa300582c631f2fe46ed25a
font_03_sfnt_off00022bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BBF 13528 bytes
SHA-256: 0bc688b400339b47cecb2bd6deb231828d1b3c2cbdd7e9fd1962df9cc5f33671
font_04_sfnt_off000257cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257CD 16492 bytes
SHA-256: 151711bac00fdf7e7f6044cf0cbca59780e956c233a0764ffe5fada1d6d13278

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