Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c732cfb18ea1937…

MALICIOUS

PDF

83.3 KB Created: 2021-02-14 20:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3650fd9b1db4381a86d69d74f5d9da9f SHA-1: 2002efcc2464571a6d5a5f428bf867f5062a7536 SHA-256: 1c732cfb18ea1937b5abe61b98b8f72e5026797672ede641b2beb5eb1f36ebed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also exhibits characteristics of a phishing lure, using language suggestive of invoices or downloads. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=warrants+cheyenne+wyoming In PDF document text
    • https://cdn.sqhk.co/sukijubese/SEFsQvC/emoney_advisor_branded_marketing_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/dumudegurit/hfVhbJ0/scanner_scan_documents_itunes.pdfIn PDF document text
    • http://mail-autoscout24.net/54884509716e8god.pdfIn PDF document text
    • http://supfitket.buzz/96777320430lu3gi.pdfIn PDF document text
    • http://nout-sale.site/tovudugibiwoji44rq3.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/ehgPjeg/jozaxaneragid.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/iahgoji/the_room_where_it_happened_title_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/Mhggrhc/84986287783.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ehe1PBw/puniwit.pdfIn PDF document text
    • http://pollsexpert.com/aster_flower_information_in_kannadafydb2.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/mhaDQPG/18004178283.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/jhjiijb/99464060886.pdfIn PDF document text
    • http://100naturals.fun/48421424432nrj0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libejejizu.epizy.com/list_of_nouns_adjectives_and_adverbs.pdfIn PDF document text
    • http://mujusitajal.rf.gd/cohesive_devices_worksheet_with_answers.pdfIn PDF document text
    • http://pikididubemet.epizy.com/epidermal_growth_factor_receptor_inhibitors_acneiform.pdfIn PDF document text
    • http://dakozel.epizy.com/47773117450.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_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 5388 bytes
SHA-256: c9316590a21aaf75206d7b8c45eb1b5b636a7b85f84861a389be96bc2dc92c07
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 9924 bytes
SHA-256: b493f0f11241a0733d2c26d829e9c07da08311b3d264669e5af5f495ab4d879d

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