Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2996a469a1c491a…

MALICIOUS

PDF

73.6 KB Created: 2021-05-23 22:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 045d46f429fa64aaf511a2a58ce45b56 SHA-1: 92fdd2713c1cd5d055afdf3794e2e4d6a9a5d864 SHA-256: c2996a469a1c491a6a0c704d8baffe26a2446dabbcdb7a98f66d3244b6befba7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=transfert+thermique+exercices+corrig%25C3%25A9s+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382961/normal_6030f59aa2087.pdfIn PDF document text
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/vivegirog-tawitofixisuta-nuviminomegon-sozajemosewi.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/965e6755.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/lewanifewewalame.pdfIn PDF document text
    • https://vubufixul.weebly.com/uploads/1/3/4/7/134708570/9432401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_601708093ee5f.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/6762846.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/wilike_paxivuresov_sizajevir_dagufoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5ff3a4e4779b4.pdfIn PDF document text
    • https://jegesasep.weebly.com/uploads/1/3/4/5/134502647/097e25315c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5ff92a1edfb0b.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/kotavovipezivoba.pdfIn PDF document text
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/godenelape.pdfIn PDF document text
    • https://fowemofuf.weebly.com/uploads/1/3/1/3/131379389/3241752.pdfIn PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/7917744.pdfIn PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/vugofutaw_sofeji.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/ad1ad33b-4923-458a-b913-b1779a1a719a/what_is_the_purpose_of_psychology_of_religion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e990c67-faec-4e59-b423-b981a62be7a6/87066167323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b712cd5f-4a17-48f6-800a-7eca8487f9d7/pixalujebeg.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/makefile_template_python.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/take_five_quartet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655f52b3-bf8a-4b45-b87f-2e29f677b0ca/surah_al_mulk_transliteration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b32857-e900-4533-864c-716ca023f367/libro_sapo_y_sepo_son_amigos_para_descargar_gratis.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 5820 bytes
SHA-256: 84b6ce077ccf9beda3101af7959cf30174247a3c497bbd6609bedae1bd65d409
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 11144 bytes
SHA-256: e9da13ea42e84c730c76431cdec151c5faf1fd728822aac16479e448c7a233c3