Malicious PDF — malware analysis report

Static analysis result for SHA-256 916e91f075da5869…

MALICIOUS

PDF

84.1 KB Created: 2021-03-12 04:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7bbe077f99174023352c22fd94e810c6 SHA-1: 695312143f9eaa89cfd6219f8d922bc9cf5a6023 SHA-256: 916e91f075da5869d16f1d81617d9453d20c7fda8694262afc7be900ccfc5b66
126 Risk Score

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 0.9991

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://jacksth.ru/wix?keyword=street+fighter+3+apk+download PDF link annotation
    • http://midutabumi.22web.org/nibafirebi.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/HiajuhN/97138838478.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/navy_seals_army_rangers_marine_recon.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/ghlUggg/champion_eleven_download_apk.pdfIn PDF document text
    • http://linorusani.iblogger.org/how_to_stop_stihl_chainsaw_from_leaking_bar_oil.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/applied_mathematics_modelling.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/cT57fyJ/great_mall_farmers_market.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/i4qgcDh/survival_skills_booklet.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/jghhVgd/polda_6_download_full_free.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/android_9_pie_for_oppo_f9_pro.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/5ae9ad94-8073-4432-b579-af0ad808f73e/81061759867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7656c3-b98a-418e-9309-4e5179b00978/88277545835.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/83422571415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03de7cc-bede-469c-9188-faae220de760/weber_stainless_steel_grates_lowes.pdfIn PDF document text
    • http://penobasewid.rf.gd/13176201126.pdfIn PDF document text
    • http://wokasob.rf.gd/bitwise_solutions_pune_interview_questions_and_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ac0da3-1542-4b71-949f-3efc9374a6eb/gubageto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a07b127-e57d-410a-8bc7-80064c542cea/how_does_gravity_affect_time.pdfIn PDF document text
    • http://kesewoge.rf.gd/86771144624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0055b2-210f-4fb0-bcc4-90820a750ea5/100_most_common_words_in_french.pdfIn PDF document text
    • http://zigejuk.epizy.com/periodicity_of_periodic_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7f87fa-ad0f-4dc1-bb82-560e6528671c/widudutusakudukisa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 5548 bytes
SHA-256: cdc89beddc5b992e44177486860f055ed81b8385bb4fc810d7455003bb29bc71
font_02_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 10148 bytes
SHA-256: 25b8ec4ae76bd81b8dab55a24578774047f852f5be98a50e9531a370b2a89bcf
font_03_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 16068 bytes
SHA-256: 89247d3646e3773572243f1d4b0449240b5d7bcbc9865045ac28c7845acd9c8f