Malicious PDF — malware analysis report

Static analysis result for SHA-256 7121d61c2ce4ae19…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 21:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0098c63c3c4f9b861d91e00ecc38b4c0 SHA-1: 59d2622cc3e82cfdd55a9fd46d583013c974b087 SHA-256: 7121d61c2ce4ae197e866a1869ce9fbacba2689494c4de39b17ccb0a02559411
186 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. 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 0.9995

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/123?utm_term=avg+free++for+windows+vista PDF link annotation
    • http://wubosuvim.22web.org/lomatabifovunabamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_602790f40cdf5.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/tivifeme.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/412214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377095/normal_600219b328201.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/lavewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_6000d360a36d5.pdfIn PDF document text
    • https://joxuripuziw.weebly.com/uploads/1/3/4/2/134266010/4052506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486045/normal_5fef4c447278d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_601f459239160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/14e7c140-5747-42a5-9e40-b4567a4b2f29/how_many_calories_in_boston_market_chicken_thigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942a3fb8-48eb-4dd0-8238-3cbf00b4f5d5/toxaxilimid.pdfIn PDF document text
    • http://kojokiguxan.epizy.com/norogisujebizesuzapirama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae103bd5-c7c6-4bbb-90ce-91081a556496/how_to_repair_grandfather_clock_movements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32235ff6-b916-4a1d-8e07-e637e8f68c83/17500754800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc526a3-3a17-4b61-a730-b75e4bc63761/what_are_the_different_genres_of_films.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b29a70-e5fd-48dc-ba8f-cca9f8a30722/854002102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62fa306-b5a6-47ae-9998-1afd43a5ee01/what_is_the_default_password_for_a_linksys_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15624c25-ba2f-47c3-ac87-88afc18f2f89/war_of_the_worlds_book_2_chapter_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2a1d06-2ecc-47d0-8a21-314dfe6fbdbb/60804789365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c6a0de-54f0-4333-b403-039f425edf20/what_jobs_can_you_get_with_a_masters_degree_in_finance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e088cba1-2425-4bab-b32f-52eefefedf78/rasozesegapezixazufezag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 4972 bytes
SHA-256: 602080269db7d2c5e3f0323d43a46bdf335cc052f06f49ed55b7cae4dc530f22
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10472 bytes
SHA-256: 33d1eb900c014f2dfbef6a2a7cf2848758b8d547e5eed82314f0520a8c959fd5
font_02_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176