Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d43be27b8af8386…

MALICIOUS

PDF

79.0 KB Created: 2021-04-09 23:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bfde33df7329b15fa2789a556a1357f9 SHA-1: 6585ebe602ed645681eb9d390fba8de298077ef9 SHA-256: 5d43be27b8af83866c715d3183b3bc1a1650759c1c8e9ead825becfdab45fcca
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=hair+clippers+set+canada PDF link annotation
    • https://cdn.sqhk.co/libegavezu/ictjoJr/jatopezovoxelov.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/WMjhckS/pinballz_austin_birthday.pdfIn PDF document text
    • https://bemijeze.weebly.com/uploads/1/3/5/3/135302335/sijibexinibijex_tikoxewematata_zodiketurogemo_begujiluj.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/bwmmiUS/cyberghost_vpn_fast_secure_wifi_protection.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/ijcXhcz/firefox_driver_for_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hgnrmIH/download_personal_sticker_maker_for_whatsapp.pdfIn PDF document text
    • http://f13x.xyz/cnn_news_today_livetd2cx.pdfIn PDF document text
    • http://buyfastedcircle.xyz/zejurotinemajolebozeluzagvjuo.pdfIn PDF document text
    • http://3gusevshop.space/introduction_to_applied_econometricsxebrg.pdfIn PDF document text
    • http://shishkin-seed.xyz/supply_chain_management_software_gartnerzomgv.pdfIn PDF document text
    • https://cdn.sqhk.co/fixosotefe/fb3vvd9/risugaxi.pdfIn PDF document text
    • https://bivogovaxi.weebly.com/uploads/1/3/4/3/134320375/d8ad07c.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/TTNggdF/death_breath_smell.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/8ba113182fa3080.pdfIn PDF document text
    • http://ideaita.fun/73406451027g99pa.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/DF9xic3/twist_stack_breaker.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/hzIjd1J/document_scanner_library_android_github.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/irnieq8/microsoft_word_likert_scale_survey_template.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/goviwigax/xutavuzomuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/du_bsc_chemistry_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/59289792087.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/botijizisesotepisigofesu.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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 5028 bytes
SHA-256: a0313347033ce210303eefb99aacbe649a8c7a5e804c62a3de479c695876ef19
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 11032 bytes
SHA-256: 6d4b7bcf971e5775c74aa5f9860d98cb36d882923953ddbb48e0894c87327f38