Malicious PDF — malware analysis report

Static analysis result for SHA-256 993821647869af21…

MALICIOUS

PDF

81.1 KB Created: 2021-05-21 21:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2035ab35499ff3541c677ac38f4ade2c SHA-1: 91ac1ece71044dcd7ae2796b5f04f616b89045fb SHA-256: 993821647869af2121ba6e0910ba23ca3464adbb24bd0bc4d4a7dc9e79593ae0
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://jacksth.ru/strik?utm_term=what+is+the+coldest+city+in+usa+today PDF link annotation
    • https://niwosegebopusa.weebly.com/uploads/1/3/4/5/134583118/figosajede.pdfIn PDF document text
    • https://mafivuvaga.weebly.com/uploads/1/3/5/3/135323118/3301534.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/vowikolokabafoveg.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/a8877632c708e.pdfIn PDF document text
    • https://kebafilononuxo.weebly.com/uploads/1/3/1/3/131378837/b974c42e3aeb3.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/8228602.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/f08cd.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/4c6270499.pdfIn PDF document text
    • https://fivaxozokudok.weebly.com/uploads/1/3/6/0/136049694/neves-tekefed.pdfIn PDF document text
    • https://voxonexagigiwal.weebly.com/uploads/1/3/5/3/135346225/zejarivama-bonijibalo.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/0b393efb-e142-4fd0-9c44-624eb9ddc49b/nupoxoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03675a9f-70cb-4e15-b42d-e6725e4b5cd7/how_to_hook_up_rca_sound_bar_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/rifaxukidolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9c63fd-ff1b-405d-8ac2-8d2d1d7f3c61/labodapurizoxuris.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/apostrophe_s_free_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db845fba-3a24-42fa-8f9d-aaf7bab7e8d7/neato_xv-21_replacement_brush.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/lakers_bleacher_report_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68655e8d-27f0-4206-924c-10d5382b75c5/what_is_definition_of_cognitive.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/what_is_new_urban_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923675da-8510-439e-956f-613675b7527d/82366142885.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_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 5044 bytes
SHA-256: 9c3df543907563f56f56eb38fbaa72102ac4d1c5986f1aa4afe2f0eadf16fd72
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 15432 bytes
SHA-256: b29233df74da5bd1ca71e7fcc09520d9243ad64851c57f54b2bd15b2ad162e43

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