Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3b4a51d69f2c6…

MALICIOUS

PDF

71.7 KB Created: 2021-03-27 10:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 07de662c1dfd6d1e316ef26e639f5aba SHA-1: dedb2b88c6376c252c27bc2c489004b4aa83be42 SHA-256: 5ce3b4a51d69f2c6c86c53435a3054b48f78dbcc86fc6c52e74dd64258f36ced
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=basic+terms+of+computer+networking+pdf PDF link annotation
    • https://cdn.sqhk.co/gubisagebuto/jhfhhgd/stellar_hunter_build_adl.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/hhiiib1/grow_credit_union_contact_center.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/pudikedatowopot-binud-madomixip.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/nkjv_bible_format.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/labufudigubo_kedalegizujevi_ruxepalizegipej_dukonewosuzejeg.pdfIn PDF document text
    • https://gorifimeti.weebly.com/uploads/1/3/6/0/136021085/3155476.pdfIn PDF document text
    • https://finepeva.weebly.com/uploads/1/3/5/3/135347337/ce2c1164bde65b.pdfIn PDF document text
    • https://cdn.sqhk.co/lodoseduler/bHaTjbA/36526349634.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ehihdAl/35444273332.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/UgigO5J/birthday_cake_ideas_easy_to_make.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/GsggjdZ/game_creator_demo_apk_mod.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/8479492.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/slCIihh/word_up_vocabulary_pro_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_b096437b0e194296acad11173495b8f9.pdf?index=trueIn PDF document text
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_3b5fcd3ff8474772999854a4ad518e59.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_6950cc67a32b4fd1ad882f9c8f82fa0d.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_b52ce40363314d68b1b47f3e2d570549.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_d0dea65333e849dd9d21c0792aaba16e.pdf?index=trueIn PDF document text
    • http://tuxodubikanirod.atwebpages.com/tofuwamubinasug.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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 5648 bytes
SHA-256: 610bf5fc7ab959a4de64f46ab178f9b35837581161b88e273045a37a5da218b9
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10532 bytes
SHA-256: 1af8e7c24a81f09d1a519309aa172bb0c090dfb8dcbbf288c560abf84ff3bdaf

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