Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d6eaf466de6c29…

MALICIOUS

PDF

65.4 KB Created: 2020-12-05 19:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a980053228432aa191a819bacabd407b SHA-1: 1643687eb0b779ead2dfa25d68e4e2af11913f05 SHA-256: 79d6eaf466de6c29b20469e4755b155ae70c98993dd570743252d25d6cf1cd97
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malformed exploit stream and numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The presence of a link farm further suggests malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious content.

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ggtraff.ru/strik?utm_term=will+insurance+cover+vasectomy In PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/suzisamugirutu.pdfIn PDF document text
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/35009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/bankers_adda_current_affairs_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/budiwokojusakebijebaz.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/video_from_instagram_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/free_dragnet_aptitude_test_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/jonarupuvurap.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/acknowledgement_of_receipt_of_goods_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/xovilegunukuvokiziso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f3af1c8c741314320bf8/t/5fc131d83570fb44d12e1bff/1606496728191/fusifofafikuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c917ca-e50f-4174-8c11-565889ab148b/saxokuwujedusujek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc107c868612547ed5eda4d/t/5fc9322542010e5dca953d44/1607021096182/marvel_super_hero_war_mod_apk_download.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 5120 bytes
SHA-256: a171f5070e8780aa163a8c1f0db9a7cd412e8bc2e583fa2eeef2da5172142078
font_01_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 9396 bytes
SHA-256: deca0ec37f959e11636ae091773776888080a7402272481ae24d15189486ed85

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