Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e3442ac3f86a68…

MALICIOUS

PDF

78.3 KB Created: 2021-02-26 17:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c96a095ab586db4dac0eaad67b5ec506 SHA-1: d8d6d23c906883eeeb7414a33dbea942676e9457 SHA-256: c8e3442ac3f86a68e9f59b775046d613818518af33a4979bc855bf82427b1d80
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate effort to create a network of links. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious external URLs.

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://resalured.ru/123?utm_term=weber+smokey+mountain+22+upgrades PDF link annotation
    • https://gutirevenomosub.weebly.com/uploads/1/3/5/4/135400373/gatovudiva-maneji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5ff78369e8303.pdfIn PDF document text
    • https://buvurujexo.weebly.com/uploads/1/3/6/0/136082217/3c6400f921f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5fcc4156713fe.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/gcojdhj/red_ball_robot_car_transform_flying_car_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_6037747a17bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_600eca8562fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5ff24be158dfd.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/7719629.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/bosamikisavuko.pdfIn PDF document text
    • https://kojelujozifani.weebly.com/uploads/1/3/1/8/131856125/gufunijibaxuzela.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://s3.amazonaws.com/kikunojulejuj/jamusobifudotakuzevut.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/asus_motherboard_sabertooth_990fx_r2.0_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/worksheet_for_powerpoint_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/75769849026.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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 5580 bytes
SHA-256: f82dd2561e59166c688aab4d91a6cf262828821c44260ed5175b82c390fd6764
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 10696 bytes
SHA-256: 3ce1ccb56a33b4f348a3e5446aa6f50e5f525b4bc7a85a4dad2ae1f40a40283a
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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