Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67b11daf770fb4d…

MALICIOUS

PDF

75.5 KB Created: 2021-06-09 11:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd55e2f1f961bb677318003eaac09bf4 SHA-1: c9628d7bc08f73e6075b50883ef83d8763987682 SHA-256: e67b11daf770fb4de06487c2d23629830b989bb4834eafc1e0e6d3d6b1c153f2
186 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 0.9998

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://kuzutuzo.ru/123?utm_term=metformin+extended+release+tablet PDF link annotation
    • https://wikexamug.weebly.com/uploads/1/3/5/3/135343860/4bf5c004.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/377698b6333.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/8058194.pdfIn PDF document text
    • https://duragafadave.weebly.com/uploads/1/3/1/4/131438389/kotijikoxuzesabonur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedidovetaw.pbworks.com/f/hyster_forklift_fault_code_168-4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a36cc2-4fbc-4a10-aca9-ed11c8a7146b/is_the_maze_runner_appropriate_for_10_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df790a87-f760-4a05-ae4e-55d27530d77c/vekebuxogowenuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1951d18e-0490-45e8-87ca-7eed4be44e35/coraline_book_online.pdfIn PDF document text
    • http://kevesefazoga.pbworks.com/w/file/fetch/144811137/delijekesilin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d718e7e5-4707-4556-819a-2d50c1899a3c/geologic_history_of_north_america_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567698dc-b2ff-42ee-a1e8-0ccc8aee0140/xabuwunivasomomezotab.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/57044909143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd7d796-bd96-4fca-ab85-951bb21b8d9c/250552972.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/f/cs2_keygen_free_download.pdfIn PDF document text
    • http://filijego.pbworks.com/f/xuzadefir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f7d371-e9ab-496c-a4a8-c8f2bbe00623/guess_the_brand_logo_game_answers.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/61501461922.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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5264 bytes
SHA-256: fed7d25403b3d26aafefe882efb5628f6a66b1b05215a8463eae9c3dde86abba
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10384 bytes
SHA-256: 254a39dabab900102ddaafbf25765da753c694a92ada3c32cad8fe1ce3803393

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