Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d88d6b415d3232…

MALICIOUS

PDF

81.1 KB Created: 2021-05-20 07:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31696e8595020484e200782ed47a77c6 SHA-1: 9016a27969c5daaa0a860631f0f5c3f68a8e786c SHA-256: 21d88d6b415d3232ad80baa22028362114fa1564a25bc38c607834f9d65dd6a8
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://pelibifir.ru/strik?utm_term=what+did+marx+think+about+capitalism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385614/normal_60381408aa269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fe0196c503d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_60437cf42509f.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/8339499.pdfIn PDF document text
    • https://ritosigom.weebly.com/uploads/1/3/1/4/131453630/tiboso.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/3348258.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/5475582.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/c0afeb31-ada9-43b7-b54f-7381a520fbf7/kebisegerujejibuvusuwuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60835e0-7340-4770-9a03-e7797c1478b3/rijowusugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c1a106-cc62-4b13-a64d-1631e20e16a1/2003_saturn_vue_manual_transmission_shift_cable_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/29084845995.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/dudalovururu.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/herblore_money_making_guide_rs3.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/99271255342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c56fb21-0b1d-4ecd-b19b-ce925616f531/50151874738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffa7abd-cac5-4e38-ba56-6f8c8bd49998/why_my_samsung_tv_wont_connect_to_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/how_much_does_a_joist_cost.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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 5364 bytes
SHA-256: e56375216d7d3cf8d3ee766348d45aea075e5b777177e38deec29cac235f6ffb
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10804 bytes
SHA-256: 536b4f0254b48527f47b21572f59eed912695d44ec5f34a3f258bc92c1393911
font_02_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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