Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b06444c5f31e1b8…

MALICIOUS

PDF

95.5 KB Created: 2021-04-05 18:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 660a9285a0c7a005d55b00c719e8f243 SHA-1: b143af51cd0a074a6e46d2fb8ab3cf4be71f379c SHA-256: 9b06444c5f31e1b8cac48c33809b1d1e58c477b7debfa23a5e9e5c5e8ecd2604
156 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 0.9955

Heuristics 5

  • 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.
  • 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=big+shoulder+workout+routine+pdf PDF link annotation
    • http://gofesirukuzud.22web.org/2008_dodge_avenger_pcm_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/hbhoOsD/electronic_proof_of_insurance_new_mexico.pdfIn PDF document text
    • http://sibasijiv.22web.org/breast_cancer_journal_articles.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/igchhhb/electric_guitars_ireland_buy.pdfIn PDF document text
    • http://wofeboz.66ghz.com/weather_report_tomorrow_in_mysore.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/ijWhd1H/xisufa.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/gb5RCsW/bodav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_00a7742a78a747dca19e06295412d62f.pdf?index=trueIn PDF document text
    • http://wixilapawatos.epizy.com/metal_cutting_and_machine_tools_pakirappa.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/algebraic_properties_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/6006971698.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_53a127a544b44808aa9e5141f917513e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/liquidez_inmediata.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_b6ab771db04c4d7ab554a8bbfd191e13.pdf?index=trueIn PDF document text
    • https://ad5375d1-0dc8-447d-a54b-f1659eeba1ba.filesusr.com/ugd/a4ba79_d1a64a3d06984c16b1d744741f4d374c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/lasurulolenexa.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_01e622c667354a5b96177481d9fa70ff.pdf?index=trueIn PDF document text
    • http://riwuzapivegeb.rf.gd/addition_with_regrouping_3_digits_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/countable_and_uncountable_nouns_interactive_game.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/how_hard_is_ib_higher_level_maths.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/easy_writer_7th_edition_by_andrea_lunsford.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/what_is_multiprogramming_operating_system_with_example.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/is_masterclass_worth_it_for_writers.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/18745013583.pdfIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_3cfa49b6f96c4956aeca7907ad9cd9b9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 5300 bytes
SHA-256: e71e1dc1d974bfedc0438effb71281fd610b5b0a0a999dfce68b1b0e1269b5ce
font_01_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00014854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14854 11184 bytes
SHA-256: 66da4a7eadd03d7339427b1eb2aa2940f7c5c51fd42481744fe59dc1987f7e47