Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4547e320bb9b58d…

MALICIOUS

PDF

72.1 KB Created: 2021-06-12 12:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bab10fda31fb5f6e6f74749962501e19 SHA-1: 4075a60d4f1b7097c27dce4e0c741417fc86a23b SHA-256: c4547e320bb9b58df5812c4289a079b59c8f4103bd4b642e62fca81fa3438cc9
134 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, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one pointing to 'archism.ru' with a 'vidmate app android apk download' UTM term, suggests a phishing or malware distribution lure. The document's structure and embedded links indicate it functions as a link farm, likely directing users to download unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=vidmate+app+android+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409396/normal_60009fcd5da2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_60b9d0e0de3c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fe9fe40eaaa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_60345f748a25c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_5fdbec5e27792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422349/what_to_do_if_you_get_a_cease_and_desist_letter.pdfIn PDF document text
    • http://gurilotav.pbworks.com/w/file/fetch/144754638/18035141912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fba41b3-33fe-4a2e-93ff-e5b2acbd9e0a/at-lp120_usb-sv_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68616228-e357-4944-bc42-b4e10635a283/wetalenuvukon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dcdfdf-edfb-4284-927d-66f08d160919/lagewegujokexatafaxenino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a446651-3915-4e77-b851-ab28d15730e6/math_worksheets_for_kindergarten.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/91016963099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac62df70-1b65-4392-abe9-f688c2be372d/how_to_google_maps_street_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1590885b-c4fc-4036-a5f7-fe36e6022aac/what_is_good_academic_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fc266d-9a2d-4f01-818a-84a32d63e935/voxomonefot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ce3802-0e03-4d5a-8e7e-26b54bad5a89/86642833842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43736c4e-4282-403e-af58-73c3483afb55/78063863444.pdfIn PDF document text
    • http://wusajigi.pbworks.com/f/fixed_assets_report_format_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fd4ae6-539f-4c8b-9b13-7334ff71d84a/jonas_brothers_song_lyrics_dance_in_the_living_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c2a4f4-339c-4099-9cb5-4a1463e73828/web_service_rest_api_php.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14d4261-93f3-4320-872e-7e254d746983/zavazuboxo.pdfIn PDF document text
    • http://tokemomonu.pbworks.com/w/file/fetch/145118199/80488822930.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_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 5048 bytes
SHA-256: ec6bc323357ffedd1fa542b227cd1853028a2db69311f138d751e0095b15be77
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10544 bytes
SHA-256: 65ef24429792688a3d83b54de073149250771f58316958fb1b45683f65df8d1a