Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9cc08597dfb58f…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 13:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b284e9122c6b5b26a63d91dfa45965fa SHA-1: 5732af09940604386f3ac61cbc4061f620787532 SHA-256: 4f9cc08597dfb58fe5e0a33775ab56207d1a2d24e6950dacdba74789b4e3f33c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://baarspo.ru/award?keyword=facial+nerve+examination+pdf PDF link annotation
    • https://cdn.sqhk.co/moturalogupe/S4jgw5h/ramefugufuvusufit.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/amina_al_mufti_book.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/wj0vjiP/beck_hyperspace_album_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rejoxapuzopa/Y0gejge/kung_fu_dhamaka_full_movie_telugu.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/how_many_elements_are_in_the_compound_c2h8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_6023da50d88e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_6051a9295d333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_602fc68bd578f.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/90736084172.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/2119563854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_601447357c4f5.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/24820142492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddd2e13-09ca-4db0-8102-180f7f292d43/15516834862.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/accounting_definition_by_different_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/grammar_for_ielts_with_answers_diana_hopkins.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/89491113644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92757280-8afa-4e8e-9aaa-f8b78a492309/put_on_the_full_armour_of_god_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fdac9a-79fa-4ef9-ae6a-b0fb6282f25a/kinewad.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_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 5208 bytes
SHA-256: 6274df56f1748d9902f94bc306f5da1fba1a1fc7476bc90c005da682833a8d1f
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10684 bytes
SHA-256: 850f34710b487dd3188957664ae2f07bd566c58ce22118e05620363590484319

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