Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b76cf3e3b323be…

MALICIOUS

PDF

80.6 KB Created: 2021-03-11 02:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1eb8a3cd1c0002e6d349225e615ac3cb SHA-1: 53e0572c00c24bcf9a4acb52b18042bec769cf72 SHA-256: 94b76cf3e3b323bec597ec371a69de45abad6fef158101ac160ee6468c809196
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are invisible and repeated, designed to trick users into clicking them. The heuristic 'PDF_REPEATED_PAYLOAD_LINK_LURE' specifically indicates that these links deliver a payload file. The ML classifier and ClamAV detection strongly support the malicious nature of this file. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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://seumenha.ru/wix?keyword=rocket+mortgage+squarespace.com In PDF document text
    • https://cdn.sqhk.co/gufemazibafi/jdMwjeO/45738812158.pdfIn PDF document text
    • http://creditscoreusa.info/how_to_find_magnitude_of_applied_horizontal_forcesbxtm.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/94ibvWg/dr_chesson_washington_nc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_60007a88eb704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_600414287f195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_60250df852df1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6046877304e64.pdfIn PDF document text
    • http://trikotoria.ru/sedasaxalatodejumoniliroda6gin.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/gowejozijugebu.pdfIn PDF document text
    • http://sportplays.ru/vulelibatat1um1.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dDK6qCy/gosuriwotok.pdfIn PDF document text
    • http://beach-fruit.fun/60693773593ydfk4.pdfIn PDF document text
    • http://neuroncraft.online/nonijajezerivezonikukisen1q3a8.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/fggaCs6/susutapupepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_600e6848cd20f.pdfIn PDF document text
    • http://100naturals.fun/pokisaxevivekade5huxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4d8541-27cb-4c4f-862e-a0d1d8be6527/epson_l110_ink_pad_reset_utility_free_download.pdfIn PDF document text
    • http://xalatirasu.rf.gd/84951597756.pdfIn PDF document text
    • http://belivadu.rf.gd/apache_tomcat_for_32_bit_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194d8906-b396-4bec-8f3c-1c22e4d83335/what_is_wrong_with_the_american_school_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e0f66c-9609-43d4-b380-c952c5f373d2/gezedatalokaja.pdfIn PDF document text
    • http://sutakepaxiru.epizy.com/36792472002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833046c8-10b9-431d-a04b-5a7a5ca5d934/graco_nautilus_snuglock_lx_3-in-1_booster_seat.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/85136245229.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_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 5452 bytes
SHA-256: 831861121cfce75e0adf2465f0cc2bfc81f52fb4c281f688f0bad280bb1484de
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 11236 bytes
SHA-256: 427daed7de1f37cf4ad4d30c97f5b92d8596868712a78055d884c74abb847db1