Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c973f974aff9513…

MALICIOUS

PDF

74.3 KB Created: 2021-05-17 07:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7fa57af28d91ef12afe8e281dc34403d SHA-1: 1ed367f313bf927e089d060638d3c897e741c414 SHA-256: 6c973f974aff9513bfcfd8d1058d43c9d48071c02661e16e7f24cebd026b5e00
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting, and at least one known malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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.
  • 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/strik?utm_term=mental+toughness+questionnaire In PDF document text
    • https://runobutadafe.weebly.com/uploads/1/3/0/9/130969205/gewowu_nesadenemugo_toxenove_gitamubo.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/hjijhjd/teach_on_mars_crunchbase.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/31118932369.pdfIn PDF document text
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/3d471a8f.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/4120768.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/r26vjdz/ultra_fidget_spinner_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/gjjzyge/82483897541.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/por_que_es_importante_la_informacion_financiera.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/d2NMjiD/pacific_navy_fighter_commander_apk_download.pdfIn PDF document text
    • http://remigajapalogu.22web.org/attack_on_titan_characters_135.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/40326161002.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/hjaDhgb/vufuzisepawa.pdfIn PDF document text
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/nuwivalaza_sobefaximid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_7ee6b1ab1c744310a0d10198e4f994d3.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_a49cac7e2f9048f0b0c394b93c530718.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_11c0db156d8941859162f4e606ce5782.pdf?index=trueIn PDF document text
    • http://misinaguzorolul.epizy.com/11434136897.pdfIn PDF document text
    • http://xezujuwevan.epizy.com/employee_manual_template.pdfIn PDF document text
    • http://bakakixutuv.myartsonline.com/algebraic_fractions_worksheet_kuta.pdfIn PDF document text
    • http://poxotoromerolu.rf.gd/american_vision_history_book.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_882d69a528e94c3e924dccd5d8a3d06d.pdf?index=trueIn PDF document text
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_a48409ad494b47b0bda49f781fe0b527.pdf?index=trueIn PDF document text
    • http://risatimax.rf.gd/buckwheat_flakes_nutrition_information.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/fafsa_en_espaol.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_7a178ded3b5c4f7bb3c0598c673e4cef.pdf?index=trueIn PDF document text
    • http://repositorio.unicamp.br/jspui/hanIn 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 5076 bytes
SHA-256: 6f99b04cd51d4f5342023a37e0830ff23bf1d7d834e2897d5550b7289e13e39d
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 13052 bytes
SHA-256: 0de96a2d7a50ab4f5d64febe021ff82c204e414c4f5258f2f58f26709d7c593f