Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da1e9508b6e59f9…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 06:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 96309d840743f8b97a666450193a4df8 SHA-1: 713cfd955d2da720debeff2bc527db39bfbcf2f7 SHA-256: 0da1e9508b6e59f974f86c5b8e0ea53a851c4aa68513984ab09c248ea599014d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=medical+terminology+a+living+language+7th+edition+free PDF link annotation
    • https://cdn.sqhk.co/rogudokives/BhbgjSL/mozewidiwabit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fe9caf1ad37d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_602be8fcf1957.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/ae47917d46a65.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jjhijfR/child_care_near_me.pdfIn PDF document text
    • https://mikexilip.weebly.com/uploads/1/3/4/8/134868220/vakiru_laxubu_lusojene_mogilefagezime.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/ditemoresobevowugo.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/jCaUPjj/gonapipanidifefekom.pdfIn PDF document text
    • https://vaxujorukub.weebly.com/uploads/1/3/1/0/131070318/sesitej_tebubesowile_pupubemufagelis_sagawafiwixedax.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://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_04f50e0c40044c7da92065e82f212173.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_7fc5915d1a5543709e9c9790becf3769.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_a15b357db45e46a29864bf77a652673d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/anaconda_python_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d791ca87-6be9-4661-b65b-71b3a06ad7e2/razones_trigonometricas_ejercicios_resueltos_vitutor.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_bf4f4b9c29ee4b14bd1f0a40f117a9fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf05c152-82e8-4957-b831-0eeced902713/96179702507.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/21515020370.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/lumigopudonot.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/taxujapexopazuxemetorodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fb2fbb-f72f-4aec-90da-5d70a7dae869/74894696556.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/software_requirements_specification_example.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_6cdc7f1cc3cc4e339e835b3ad623e04b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a356b8ae-14be-409f-bad0-b8fa9584d07d/jevizifofepegu.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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5384 bytes
SHA-256: 1d3c7a06711db768104dd1c43c01cf092ebc4009459d2397fcf9d193b1893d39
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 11092 bytes
SHA-256: 27bef73bfb9c166ae1f4945a9d0a7b348ed13a08fa5a8cdbc8b92f46e559bfb3
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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