Malicious PDF — malware analysis report

Static analysis result for SHA-256 7824f3f7868f3a92…

MALICIOUS

PDF

82.4 KB Created: 2021-03-14 19:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5b177c46675ec08a41653690c6a40d8 SHA-1: 261658d30144421927723acd30e41bccfaf71b2c SHA-256: 7824f3f7868f3a925c29d9324b24859b452da64eacf88a2891172d5176b79676
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm or phishing lure. The embedded URL 'https://midufefew.ru/123?utm_term=back+to+you+bebe+rexha+song' is particularly suspicious and likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://midufefew.ru/123?utm_term=back+to+you+bebe+rexha+song PDF link annotation
    • https://cdn.sqhk.co/vumusokutil/Tigghj5/46893370986.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/gjbgfgd/alter_ego_definition_from_health_guidance.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/cjet6R9/nick_jonas_height_weight.pdfIn PDF document text
    • https://latiratigu.weebly.com/uploads/1/3/1/1/131164156/8fb85fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/umicxhb/get_likes_on_tiktok.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/dubitor-senusujid-joxapep-papogokore.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/Stiejd8/37319506424.pdfIn PDF document text
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/dukaxovazuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/PGeEDia/3188600334.pdfIn PDF document text
    • http://pokuwasu.iblogger.org/android_graphview_bar_graph.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/hdigfgf/fuzerazarijunoxis.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/cvWihhc/russian_front_medal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_d2c7a0ae0df44aba9cb9dec6b475089a.pdf?index=trueIn PDF document text
    • http://fedavuv.epizy.com/gadadatinuwa.pdfIn PDF document text
    • http://nebodukipakesag.rf.gd/united_healthcare_commercial_state_of_california_prior_authorization_form_state_mandated.pdfIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_e23c7b2c62664f6f9cdef83d1092586b.pdf?index=trueIn PDF document text
    • http://tosakiviga.rf.gd/vubutajow.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_813ed29f568d4797af2edc53594c6b21.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_ebfb37ef9aa849e9bdfcb4c54a48c772.pdf?index=trueIn PDF document text
    • http://zaximibirada.epizy.com/gakemipowekasegupelisoje.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 6168 bytes
SHA-256: 7f03176b67921aaa7b79135688821bc5b9b9f75c75c66433a9b7533780a50ba7
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 5288 bytes
SHA-256: e266da2a21ea7d42b0cb1a048587d73bb52b0c543b0ae6ea18c8c0cd5b6522ab
font_02_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10860 bytes
SHA-256: 343e608c14be865affb1336536fc4e648348699625e642b9d08f9fe9c2938d50
font_03_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378