Malicious PDF — malware analysis report

Static analysis result for SHA-256 271abe6d638672de…

MALICIOUS

PDF

74.5 KB Created: 2021-04-12 08:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 960cd34bda0dc81120987aed51ef1061 SHA-1: 09414b4823bdb550554b794307fbc73de9b3857c SHA-256: 271abe6d638672de9c03fbff6ad08c426f5b829337b682fa080b920b93b830ca
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://lozipotod.ru/strik?utm_term=how+to+start+learning+method+acting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fd91932047c0.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/cc6ab640.pdfIn PDF document text
    • http://olymptrade.buzz/muwaruwav3vid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fefa22b7a98b.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/7a1e0178edf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_605ac5b36223f.pdfIn PDF document text
    • http://perevod24-card2card.site/jifojokopotevaxc1i15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_606016900910f.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/4137267.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/1991417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5ff29993de45f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_5fc9e828e03eb.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/vexeliku/find_cdf_from_continuous.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_dc045ae9d7fe48a89a2a25038e0fa940.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_51b050d0ae614f5eb66d9187e163a52e.pdf?index=trueIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_23a467b9f4e8470c952bf5efdea8f6f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/brinks_led_security_light_bulb.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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 5408 bytes
SHA-256: c6a3d6e8dc84ad8f47ef46b0d729090e5d3a40555e3c7f7bfafc87c94e24c553
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10824 bytes
SHA-256: 338d308a281ae9c144d286aac6b1c2ea01f115e937a6c4a219cd581f828c25b0

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