Malicious PDF — malware analysis report

Static analysis result for SHA-256 631c570475d47c67…

MALICIOUS

PDF

71.1 KB Created: 2021-04-02 13:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b5b6fcda576fbd1f2d50f67282544d43 SHA-1: 0d5fbdbba23650d2af4674bb66c483b622e34e7a SHA-256: 631c570475d47c67a6d560e5d33aca8974989a74c7cbaf5df1f5758711c977b0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or domains associated with SEO link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/wix?keyword=nebraska+soccer+league+rules PDF link annotation
    • https://cdn.sqhk.co/rafumufo/whfiegd/microsoft_edge_web_browser_first_introduced_in.pdfIn PDF document text
    • http://puxelamonikur.22web.org/luseteradafikixakiropej.pdfIn PDF document text
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/549c3422ddc38.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/ffe4278eaf1c8.pdfIn PDF document text
    • http://ripuvajuze.iblogger.org/pakeveb.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/NUjbdje/elmore_park_middle_school_basketball_team_2018.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/fosufunenilope.pdfIn PDF document text
    • http://zinuxuf.22web.org/nfhs_volleyball_score_sheet_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6ca3bd59-594b-405c-bc74-80913f5a9e71/13603027628.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_6c315bcc086542c29e8cbafd5d331e5b.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_b965483b6a48469984da3aea5682f57c.pdf?index=trueIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_c12dd64bcc2347fb8c33e80110e90859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0ad559-7067-4e51-b5a8-0cb001716ce7/67271791174.pdfIn PDF document text
    • http://feramivo.rf.gd/syringa_bloomerang_tree_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffbc1ad-07aa-46fd-beb2-ea373dd70903/umbrella_academy_comic_vs_tv_show.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_50089b1ea2974768ac5aa7cbf198ea94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aaad2c-1469-4846-8ba7-eca6d6cd9f8f/lakota_woman_mary_crow_dog_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac1ed54-be47-46cc-8840-005a533b127d/cannon_safes_made_in_usa.pdfIn PDF document text
    • http://kenugaderagof.epizy.com/ansible_copy_template_overwrite.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_eda51601e0e74a78aac8bf64441d0ddf.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_3edaba2877f94c039f1a1ad09060f5f0.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_234b54590cb246aaab8904ae7ab1a41d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 4788 bytes
SHA-256: 4072c67df04f62f40578dffd1cb157bfd41335ef3628823b3956d1f435dfb896
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 10432 bytes
SHA-256: f0a6800d74c31f6982153274edaca9243e177c272ec6587e5f9da827f72a9a40
font_02_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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