Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7a48f960c973d6…

MALICIOUS

PDF

81.9 KB Created: 2021-04-03 20:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f02f5c7c3bc7ccc344149d8247431a9 SHA-1: 08454dcd3e657344c590ccb07314a49aa66e53b7 SHA-256: 1c7a48f960c973d6dcac5b3fbac5cece1bce627cdcf78cd960015924e279ff42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's part of a larger malicious campaign, potentially using embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=simple+physics+experiments+for+high+school+students PDF link annotation
    • http://veselutut.mywebcommunity.org/42214632500.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/4683841.pdfIn PDF document text
    • https://levubitadogu.weebly.com/uploads/1/3/4/7/134727965/fapozilefow.pdfIn PDF document text
    • http://pasetbs.xyz/french_months_of_the_year_worksheet_ks1ve8sk.pdfIn PDF document text
    • http://devicesprotectionforusers.site/risoxataxafabusojewd4hnj.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/217563.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/vimaf-jefejitu.pdfIn PDF document text
    • https://kutufesivom.weebly.com/uploads/1/3/4/6/134632784/lemuju.pdfIn PDF document text
    • http://arendagg.xyz/49009754200f5gf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_fe5e47cacaac46b2bd933bb3cc5935e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06375f97-15ee-49e7-8676-821726af1793/cdj_2000_nexus_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec225964-e83f-4de5-bad1-96d4cb441143/24585478535.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_06fc2c707c244f4d99fefa5f94d60bbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cbfb27-b904-44a2-8cad-6aab2c76725b/miss_peregrines_home_for_peculiar_tamil_dubbed_movie_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e55c42-e504-492c-8470-0b0e6f817421/python_dictionary_examples_for_beginners.pdfIn PDF document text
    • http://nizofikunatafu.atwebpages.com/engineer_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20fd144-fe7a-4a7b-a606-b223f86be109/strength_to_love_martin_luther_king_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf8e2ce-5ff9-4e4e-b0c5-33b26b3c0c22/introduction_to_management_science_13th_edition_ebook.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_1906557e172845f1a5a4b4c1d4373cb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acab7c8-2822-43b0-954a-546bc2cfe32f/what_is_ap_mode_and_repeater_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72033e8-4b4f-41db-b6d4-a72afcb917b6/lizimetologulepibive.pdfIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_8f7f17e778e84ab7a3416f8325ced296.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_6f65e4cf3346440b92c3f2393e25b815.pdf?index=trueIn 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_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 5632 bytes
SHA-256: 624b77f216ae1ccf137529f94bc62d1771bbb689583efcea1b84e9155f27739f
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10284 bytes
SHA-256: e297216c927e4f837c70ec67d82cd0328c800d9ef5035b7d4537f7ab055180fc

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