Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd32b46303a31530…

MALICIOUS

PDF

82.2 KB Created: 2021-03-26 08:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e131c166c2def3685678bb78a2743b34 SHA-1: b9134543820b652184c587d5530b1f14808f7c41 SHA-256: cd32b46303a31530e504c613ce41969c976e89f1f8826591eeafa352c369601a
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://druttle.ru/123?utm_term=mobile+accessories+website+templates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421614/normal_605923d07e973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fdafed5698a6.pdfIn PDF document text
    • https://woperuxotuxolo.weebly.com/uploads/1/3/4/8/134849923/ruwogava.pdfIn PDF document text
    • https://pixogujoxekame.weebly.com/uploads/1/3/4/7/134715770/jojum.pdfIn PDF document text
    • https://modisogisutoval.weebly.com/uploads/1/3/5/3/135390942/4451326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/caec6e52-a666-4baa-bf64-353991f47cdf/how_to_use_writing_fonts_on_cricut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724d6e71-8f89-459f-bf2d-308244f5308b/93171920865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c7a14a-5c80-45ed-8294-30db709b4b5e/sapudilaguleremesok.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/nefolusasopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e7fb29-4ba9-44cf-9d81-1508ff6a0dc5/how_to_install_honeywell_furnace_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/96760594607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2082cff-00d1-48b4-9563-0012159b013e/genie_model_2028_manufacture_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb2f868-e7ef-4a77-80da-778e2d0699f6/kabc-ii_nonverbal_interpretation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/priston_tale_aging_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55099484-8bae-4137-9746-e3392dedc3ff/82640675468.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/reket.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d7bb7efe68f6429fac9efd8a901c00e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/what_is_the_reid_interview_technique.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_41790d0b67bf459bb3e154aea46d1baa.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_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 5316 bytes
SHA-256: de7545577d1206a2fd447681cf1d9855a64fbf270f8c6310e68ca346913c7346
font_01_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 10864 bytes
SHA-256: 0380de43147bc120e65876513e943504d78474bc8f1fda8f0f49d9acbcf7209f

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