Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d5b93e07446cca…

MALICIOUS

PDF

90.3 KB Created: 2020-12-27 16:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 832e1df35dc3c430acd867997581b349 SHA-1: c45811d1a5096da4f4211cdb25dee0f36051fbba SHA-256: c5d5b93e07446cca53ed0ab091bf2fcff93260c19f6d9cd02df626da838624ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffset.ru/aws?utm_term=arrl+vec+open+book+test+answers PDF link annotation
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/vovujifetifegu.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/nofimotibu.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/2038861.pdfIn PDF document text
    • https://bekozowa.weebly.com/uploads/1/3/4/7/134713297/vajetaduf_lesem_woxuvinu_gonibiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fa6aa68924c6.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/89f755172082.pdfIn PDF document text
    • https://jigugelelatowo.weebly.com/uploads/1/3/1/4/131437208/jibapenodez-pevuxobo-zuvujujajudawe-jaxokiboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5fa396e3256fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7a12bef1-a955-4f6e-ae2f-08e7b57ea1ae/noderadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e590ad22-6254-4ca0-a58b-3b8fa5f594b3/standard_coffee_table_size_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360617b9-658e-4a16-846d-292a5dbd024d/jalata.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 5012 bytes
SHA-256: a548aa4e8749424b607040649cc60b806901d9dc3542ac65df49313f1911bebc
font_01_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 11520 bytes
SHA-256: 7bfe87b5b7cf51e70d2c478d499b2ed17369630e87231f3de6745ac427c8c531
font_02_sfnt_off00014dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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