Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d24a4bec71cce0…

MALICIOUS

PDF

81.9 KB Created: 2021-02-27 00:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc50f150ecc250b5c17b085e6a2b602a SHA-1: 6d4dfcd2a852d8d3c038913b1c04ceaf69c3058e SHA-256: 33d24a4bec71cce07ba7ddc3aeaaf04c07ce733266cf961041a9f9475480fc92
126 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a search query related to syncing a Fitbit, which is likely a lure to disguise the malicious intent of the embedded links.

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://jumiwimov.ru/strik?utm_term=how+to+sync+fitbit+charge+hr+without+dongle PDF link annotation
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/1413413.pdfIn PDF document text
    • http://beautytopshop.site/adobe_acrobat_7_macd77lc.pdfIn PDF document text
    • http://3gusevshop.space/71921551551ujv29.pdfIn PDF document text
    • http://fofafik.iblogger.org/al_quran_dengan_terjemahan.pdfIn PDF document text
    • http://zakemelevij.iblogger.org/dolupababar.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/best_wordpress_hosting_sites_2019.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/moxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fdb35ce23627.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/jejutugasabav.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/9354520.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/minaxigevani/bible_english.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/best_text_editor_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/fields_of_gold_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/process_improvement_templates_free.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/android_file_transfer_windows_8._1_usb.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_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 5580 bytes
SHA-256: 27bb1a5b453ec2353c196ca908ac64f7658227da4db25ff095a8ba1ec0c7582d
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 10796 bytes
SHA-256: a1169c4d65172ca171b4d3c3c821e79dcc9ba7667329574c7e5c9f613ae5c4ef

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