Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1cbc3913120bc1…

MALICIOUS

PDF

71.1 KB Created: 2021-02-18 04:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c91594e963ead97a074c42ebb52caedf SHA-1: 721b74462790e8572e238c65e4f5be546d5fc7f7 SHA-256: fb1cbc3913120bc133f7dc0d359d136da07434c8dfd730e39beb617d109ae87c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or link-farming scheme. The presence of these links indicates an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=how+to+access+kindle+owners+lending+library+on+ipad PDF link annotation
    • http://dujaliz.iblogger.org/qasida_burda_lyrics_in_arabic.pdfIn PDF document text
    • http://avtovishki-msk.ru/vigunurr4vr1.pdfIn PDF document text
    • http://mishabelle.ru/what_is_the_role_of_kernel_and_shell_in_linux_operating_systeme7znm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_602b2718e7739.pdfIn PDF document text
    • http://options.expert/gigopatabijipijinizusuleecqn.pdfIn PDF document text
    • http://afracheat8.xyz/63202739398cxszm.pdfIn PDF document text
    • http://sparzha.club/948327407tw7zh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5feda5d9473e5.pdfIn PDF document text
    • http://pifozuvarivin.22web.org/define_nomenclature.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_602d92711a67f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timeziso/lightning_for_outlook_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/pubijojores.pdfIn PDF document text
    • http://nawonuzegajosi.epizy.com/dulukogewilutuzip.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bitlocker_win_8._1.pdfIn PDF document text
    • http://lakiver.epizy.com/recruitment_tracking_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/fijiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/bollywood_movies_in_mkvmoviesking._com.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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 5600 bytes
SHA-256: bda5aedd83f3dba6927dd98d4a199e889d50b53926e620e6a7cff45a08366540
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 11696 bytes
SHA-256: bbdc0e55e49236e14b7a1e630b13a0c3f78b935a9947bb085839bf6c9862bd6d

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