Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdb20300aba4472…

MALICIOUS

PDF

76.5 KB Created: 2021-05-17 01:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b4fcb96be12f17d0636953e8ca649d90 SHA-1: 2484b325c87ae1543a58148f509a8226183a9bd4 SHA-256: 7bdb20300aba4472cc4409c38c46d2ce4ecfbcd37d9509c65a17057861690426
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious and exhibits characteristics of a social engineering attack. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document also contains instructions to disable security software and run commands, which is a common tactic to bypass defenses and facilitate the download of further malicious content. The presence of multiple PDF link farm heuristics and ClamAV detection strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://jottigo.ru/strik?utm_term=local+area+connection+doesn%2527t+have+a+valid+ip+configuration+win+10 PDF link annotation
    • https://cdn.sqhk.co/zejegure/ijjeBgg/sewebuto.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/4Mgidhd/apgar_score_definition.pdfIn PDF document text
    • https://jabizujosewej.weebly.com/uploads/1/3/4/5/134584717/fddf0a9b65ff1e7.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/1hjaJgj/vutolewoderozofepis.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/nDEghiN/tulizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_602d5366da0d6.pdfIn PDF document text
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/de09f.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/5923036.pdfIn PDF document text
    • https://cdn.sqhk.co/bitulore/hgOifKf/gedibezoxozimefuvosif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_60242a9401090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_6020d5278c62b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fc63979c88e6.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/b7b0fafc-a7ab-4ede-b753-b34da52c361a/nawegafakuperorezoxiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba04328-76f2-442d-ae29-99c0cd2671d4/computer_books_for_beginners_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/61758135683.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/behen_hogi_teri_movie_filmymeet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdaea7f5-e404-4e87-8483-2152955998da/18202653691.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/fojuvagasiwawap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455049aa-4a8a-4322-94be-d3329b3be166/4136852235.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/beethoven_piano_sonata_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e57800-e566-4400-aae0-24d44305a6d3/zovuzawunopi.pdfIn PDF document text
    • http://gegumapobok.rf.gd/54865843731.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5736 bytes
SHA-256: 0da3f888557a4319c3e60155bbade22103596cf8b274649e015e07088c50bfa6
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 10368 bytes
SHA-256: 5b2b32f0ac4a94d767f8095091c924fcd5a5a5d830553a090f83e55e0bc14fac

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