Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f7e3c7152e6496…

MALICIOUS

PDF

81.1 KB Created: 2021-03-13 15:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb5cfe90f0386867d42e180bf5a91620 SHA-1: a900eebf5374762ebe3f2e1d2d2868fc7ae93f50 SHA-256: e9f7e3c7152e6496736d4c438197a38a254935d9cee278a36a8a59dbf11a43fb
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=gcf+and+factoring+by+grouping+worksheet+answer+key In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fffe243509c7.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/vhiidgh/videopad_free_video_editor_and_movie_maker_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/cFhjLgc/80546087073.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/XpHCGjc/summer_nails_ideas_coffin.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/heQc1hh/marble_run_toy_directions.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/dHOihjq/arany_janos_walesi_bardok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_60475ed12da5d.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/ifOmjc0/xatuxafolovepakabikel.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jBwqtgf/paradofafivufogipekomin.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/XmjcgcU/41298026496.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/2jcjehY/oceanhorn_mod_apk_full_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fe9ffda6703b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fdefab91956f.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/I77Igfd/faserenajevaxavolugadip.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/vovabagubajegeb/gospel_choir_performances_london.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/homographs_worksheets_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/75900509058.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/realidades_1_capitulo_1b_answers_page_27.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0922b7c6-5ad3-4dee-85f5-80e4fe699dfb/periodic_trends_worksheet_atomic_radius_answer_key.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_56aca26baab4448e912bb67570fd62d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a801326c-d9ec-4970-9476-18dd650bcefb/23047690721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8830c69-d594-4985-943d-80188363a2a4/john_deere_gator_6x4_maintenance_kit.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_213ee31dcc6449529c50850b3773e27b.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_44f2e8b6de134d2b87426729389b1fee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cb402a-b448-46b2-834b-c32b7c2aab3a/pakijafijupitafuwunapej.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_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 5812 bytes
SHA-256: 2f18609a38fc100d879effc1d151547a8bfc87ffe65fd5b91de3c7aebe303ef2
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 10972 bytes
SHA-256: 57ba75d05cdd1356a42c3b49679487d2ad4bf55b01deff5f5e0c2f125d869f5f