Malicious PDF — malware analysis report

Static analysis result for SHA-256 be97dc160feeed6f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-18 06:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a57d780f2ae32849048e153e09fdd6b SHA-1: a0d9d30746df3f880eabe41c569b737e50c67498 SHA-256: be97dc160feeed6f661441d93f7bcb0e994df84245517733b16b2b8c2694451c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to resetting a smoke detector, which is a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+reset+a+kidde+hardwired+smoke+detector In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff88ee7083a8.pdfIn PDF document text
    • http://perevod24-card2card.site/vufejagetonufefariny8hig.pdfIn PDF document text
    • http://lunamawel.22web.org/wixax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_602a8c238d3b7.pdfIn PDF document text
    • http://ita-yog.space/poe_delve_league_challenge_guidewdn4m.pdfIn PDF document text
    • http://vezerfa.xyz/what_is_the_best_125cc_dirt_bikemdpc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fe6423295193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_6018c52593e53.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/ghYLAhD/list_of_offline_soccer_manager_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_600e02555d45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_600ba5a370528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5fe5892eaedd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5fe1c814935db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454682/normal_5fee3da5abbcc.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/vemomizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabukizazuse.epizy.com/nolibunapu.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/de_cero_a_uno_espaol.pdfIn PDF document text
    • http://jopewadakos.epizy.com/wuvix.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/duxipaduw.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/40959639405.pdfIn PDF document text
    • http://gajiwudozu.epizy.com/accenture_technology_vision_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/appium_set_android_home_mac.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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 5264 bytes
SHA-256: 88b6a231292694a047ac60d749570b6c43817776d3e6bbe420b4043544b9b9fc
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10864 bytes
SHA-256: 4e6076ed991a94463cfc90786d6036ccae84d55c0cfb731c0eaf5d0e3af7f4cf

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