Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88c14c6b6f7f848…

MALICIOUS

PDF

83.4 KB Created: 2021-05-23 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b7e7e6eac9ac4ec62babb6b12022879e SHA-1: c1357a3053d7fcbf2ccfaf91073587783980f71c SHA-256: c88c14c6b6f7f848776419e2a40e8cf5201786d9de74a1b52957b574243e656c
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=be+continually+filled+with+the+holy+spirit+bible+verse PDF link annotation
    • https://somubedalirome.weebly.com/uploads/1/3/4/7/134719542/rabenumamumogugusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fe0f13a8b518.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/modededevijivo_xadunasuzimogo_desanalitetal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_605c65cb2318f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5ff79d0c0a150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_6065e97b60407.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/5876a59a00d.pdfIn PDF document text
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/ca94875611f99c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ffe90d75a673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd111eab982c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_60121e706dabc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/62117342654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce992d7-7496-4bf2-8156-2914d0d1a0dd/zibunosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08f799a-2f7f-4308-969e-3407fdf4aece/69353776867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46115771-43ab-474b-8526-24d9f841103e/55599946560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a41222b-1075-4f74-8f0f-447672325275/is_honey_badger_dangerous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc17ea87-7f50-4c35-aef1-3bf16a1aeb74/delta_scroll_saw_blade_wrench.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/bollywood_movie_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28abca3a-b755-4fab-bd23-039a9845c0f4/difference_between_uppababy_vista_2018_and_2020.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_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 5684 bytes
SHA-256: 3ca4b640e2b6775d653344987981ff6b96f5392957f56c1327b9be8c9f88ac56
font_01_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 10756 bytes
SHA-256: 3ec73df9d6b9030983b83df7b37890c800df441b5ad132f6bed9506edd251eed

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