Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fa6d9c17678ac8…

MALICIOUS

PDF

86.8 KB Created: 2021-03-20 04:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 88ef6f1eaa0f54a06422f7f587513f23 SHA-1: 2bda990cea910d545daee06653eef8bc8bc18da3 SHA-256: 91fa6d9c17678ac860ce45850876a475056c2d72f2a99833419d732eb5870d7a
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://fokemale.ru/strik?utm_term=best+football+training+app PDF link annotation
    • http://laithub.pro/403929424828pfon.pdfIn PDF document text
    • http://uplrezina.site/boa_vida_healthcare_reviewsndpu6.pdfIn PDF document text
    • http://milanomodaitaly.site/diccionario_de_americanismosxzcax.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/4996273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fe656f02b489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_601927e5df175.pdfIn PDF document text
    • http://moresukko.ru/xexinejamavedasepijimoxy2z55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fc59acd7e00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_6049d365010f4.pdfIn PDF document text
    • http://autobaff.xyz/7280478119h3qlu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_604441b5418fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd60cdda998d.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/litojut.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/5c8d3fa7-d63d-4c92-bb9e-cc40129c2f02/thompson_center_hawken_primitive_rear_sight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e8acf9-436d-4ad1-953e-1cfc4001f646/where_to_buy_original_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cd11b3-c339-433b-943d-aa1d6441efd3/water_wheel_horsepower_calculator.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 5260 bytes
SHA-256: 5a868eebb0d60820317744367530f58c201fb62280a90906a8c3e515b12a64e8
font_01_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10852 bytes
SHA-256: a150acef13d33229c8f3d199b40f4544507eb294719654007cf149fb49d00d49

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