Malicious PDF — malware analysis report

Static analysis result for SHA-256 4575c8cc6f217d54…

MALICIOUS

PDF

75.9 KB Created: 2021-03-31 20:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85a47741823703ef3c4589511f813a13 SHA-1: e877cc0f404e9f25a07823efb1dfe817ca5499a1 SHA-256: 4575c8cc6f217d54b8e4b3d32326105be6dd6c7fcd3930b396a7ee84ec4787fa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/award?keyword=nhs+depression+test+pdf PDF link annotation
    • https://cdn.sqhk.co/torazanopuni/u2htbjj/angry_birds_2_full_movie_hd.pdfIn PDF document text
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/tonufomoregari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff637037c7e7.pdfIn PDF document text
    • https://cdn.sqhk.co/mozejipakas/4KNhanE/3427389935.pdfIn PDF document text
    • https://rutuwupu.weebly.com/uploads/1/3/1/3/131378820/vonogiteza.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/Dgihv6t/invitation_to_birthday_party_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/hhcic7j/sunulor.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/vagixogoxisebu-mibit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff16d8845d98.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/h6QgdwF/fogofaton.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/waduzirader/chole_bhature_recipe_video.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/fotocomposicin_que_es.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0618fb77-495d-44f2-9818-bc7a016659de/how_to_set_up_coway_air_purifier.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/14280931467.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/brand_equity_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/auto_blur_background_portrait_photography_dslr_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/gadamozoriluzesaniwedudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d103504-844f-43d2-ad82-72d35d60cbe8/how_to_get_auto_repair_license.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/dofabuba.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/android_bottom_navigation_without_animation.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/brookfield_state_school_uniform.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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 4856 bytes
SHA-256: dc4d0c18518a6091154ead56ad41e1d3272e1c0dc8e5b4522d5950c04892f626
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10380 bytes
SHA-256: 98dbc41df605da0c5b69a8ff624f1a738d1edf55ad1b0e843956780a3edf05bb

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