Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc03511861dbe03d…

MALICIOUS

PDF

66.7 KB Created: 2021-02-12 20:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f20413425c6e0477db811e8187bad51 SHA-1: 32110b950b94ab4491447584158460fcb41612dc SHA-256: dc03511861dbe03deaedfec8954357ffae52a2c30d2e969be68e28fe04249cdb
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Vcf to pdf converter apk' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=vcf%20to%20pdf%20converter%20apk PDF link annotation
    • http://gooddevice-online.com/59592875103qen4b.pdfIn PDF document text
    • http://fastpysystem.online/641936494199nxer.pdfIn PDF document text
    • https://cdn.sqhk.co/gowexenopa/Psihie9/bollywood_instrumental_ringtone_download_for_android.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/1c02f8ac.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/9dcee3cdc1d49c.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/ijXibNf/81429234345.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/juruposedoxixokuxijifatifhik2p.pdfIn PDF document text
    • http://igcopyrightclient.com/40922711378q6l2r.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/FgyidXN/dalifibiwilozi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/ijgggif/stronghold_kingdoms_island_warfare.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/jbhagih/student_beans_gymshark_rabatt.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/mefemiga.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/fcgiIia/chicken_gun_mod_apk_1._7._2.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/85047268284j84fv.pdfIn PDF document text
    • http://arm-watch1.club/moxidonovobugosilovujavepdokye.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/idEhaKG/hide_and_seek_map_fortnite_creative_code.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/lefemijip/42232009855.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/11th_class_chemistry_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/french_english_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/environmental_impact_assessment_report_format_india.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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 5028 bytes
SHA-256: 198e4da4bff973e9bfd5dfb3138e4dec628ea53445562738516ffba240b4e7fe
font_01_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 10612 bytes
SHA-256: e98b9650352e919fb7c1045f2817e7d79b7dea55ecede2e8786e3326705b0d2d