Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15f4946e2df10a6…

MALICIOUS

PDF

90.1 KB Created: 2021-03-18 08:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 240694b0a7e4c199422584fdebd3fc6c SHA-1: 66ca20a3488a208f91d6ca9c2741ebc964f8fbf7 SHA-256: e15f4946e2df10a6338b5f8f41ee05d2838c8a098628583472c6af4f5fdf1439
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded links, functioning as a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lure users to malicious sites. The PDF's structure and content indicate it's designed to facilitate initial access via spearphishing.

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/award?keyword=maintenance+of+computer+hardware+and+software+pdf In PDF document text
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/tijoxom-ritunig-zeximupojor.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/what_is_the_setting_of_dr_heidegger_experiment.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/kanolavoneg.pdfIn PDF document text
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/puzivelurerega.pdfIn PDF document text
    • https://durewipi.weebly.com/uploads/1/3/5/3/135301904/dbcebb4e216.pdfIn PDF document text
    • http://gagefiwirimat.medianewsonline.com/pabugogazuriwemukikufabe.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/naxoso_xunabibel_givadaxerapeb.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/61504027740.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/4dadc7c6-4191-4bd3-a753-9db6321c3125/madajedamale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6796f46-bad6-410d-b664-32831cbb3193/vebosowativoledujogeretix.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/are_sonic_toothbrushes_really_better.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/xezaxivarakesisukubiduraw.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/lavamopox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4cc99d-10db-48b7-a39b-9880571d4240/what_is_the_self_fulfilling_prophecy_in_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16db34a0-0eb1-40c3-a424-c7b1b2c229df/did_you_hear_about_math_worksheet_answer_key_page_31.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_fbb639b7a742463d8722ba431c492f8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/695de2cb-0b68-4f37-9ad7-95a011e540f1/wogivemifaxuwobon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c329575f-289d-43ab-981e-c67c3a892362/74922947664.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/felizupefepof.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_8fea9ebba8e14705ae5a379d6ae0e41d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab4fdba-b702-4f90-9666-e8a794292817/74271100286.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/60769231454.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_b5295119d48a4724888d603761efa035.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_61133932348449e39a49cf8a3ae8e69c.pdf?index=trueIn 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_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 5460 bytes
SHA-256: d18b8a51193a6ce1feb660903d9fa4e61d6d0bf957efaf8f83a0a123fe90fbf4
font_01_sfnt_off00013538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13538 10820 bytes
SHA-256: 21df701fee61a08b553a5d2dabbfdb56bd001c691c4d0a4129e3d70437f1af6f

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