Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55addc4ab57eee4…

MALICIOUS

PDF

113.6 KB Created: 2021-03-16 11:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c84cc011364717e28f2b5da3b5d0d86e SHA-1: c62f5490e8792f58bb6f34985ba332237f3667e9 SHA-256: a55addc4ab57eee4bb312c570fab8a74b0d414730bab0383a7b9bb5491ad8e82
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://leonvi.ru/wix?keyword=the+golden+compass+script+pdf PDF link annotation
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/8f4715.pdfIn PDF document text
    • http://lagulatobir.iblogger.org/84864294428.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/dodoxag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_6044675a8b301.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/argumentative_writing_outline_middle_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5fe8433e8f204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_604aaab98cdcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fd060834c5d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_5fdbc5447c113.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/buku_percakapan_bahasa_arab_sehari_hari.pdfIn PDF document text
    • http://lifizix.22web.org/rarosujejagalanini.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/187208c29f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_902870d79d6d4c07884e6f1b6de12332.pdf?index=trueIn PDF document text
    • http://sazororazinub.epizy.com/95852932909.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_b1fae30cef6e44c4b4f17b2797c90e44.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_8d0ba73744d34e4699a1366d164f21fe.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_off00017c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6D 5516 bytes
SHA-256: 34aa123224a8055997c05bce60d7eb13347ef66474bb028234ed027cb18410c6
font_01_sfnt_off00018f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F06 12020 bytes
SHA-256: be1e628aa5440c887e622c92c3d2ee365abdb043238702a4ac063082285f3dda

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