Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53877cf7b403412…

MALICIOUS

PDF

81.9 KB Created: 2021-05-31 16:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50059b5ad207feeb0648f8e0ed66ddf7 SHA-1: fe706d922b6a9b484615a40199d2d36ead268802 SHA-256: e53877cf7b403412c2c1c7a3270114a7d3c67fa9ab7b42311d19ab0306972f5a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary malicious URL identified is zajinet.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=gbc+letter+size+laminating+sheets
    • https://ledunadexaw.weebly.com/uploads/1/3/0/7/130775166/4069538.pdf
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/692510.pdf
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/7fd715a.pdf
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/7250722.pdf
    • https://cdn-cms.f-static.net/uploads/4420748/normal_600cec5bb3c70.pdf
    • https://cdn-cms.f-static.net/uploads/4485828/normal_6046795f67c16.pdf
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fcb3fc187274.pdf
    • https://jipafevumo.weebly.com/uploads/1/3/1/6/131636956/90a1ba3610.pdf
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5ff36f288af17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e72c6457-86d3-4310-9014-216ab308ce4f/have_not_received_child_support_payment.pdf
    • https://uploads.strikinglycdn.com/files/3f1f5a16-fd9c-4a0f-a1f3-42570f9c24c1/where_is_the_choke_on_briggs_and_stratton_pressure_washer.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144412035/headway_pre-intermediate._workbook_with_key_5th_edition.pdf.pdf
    • https://uploads.strikinglycdn.com/files/9ddfe833-ed1c-4d69-bc39-7715e63cb133/7885389817.pdf
    • https://uploads.strikinglycdn.com/files/61a775be-ee96-42a4-80d2-db85244ccf97/revolution_series_rear_seat_entertainment_system_replacement_parts.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144412011/chord_sheet_guitar.pdf
    • http://gajufabeke.pbworks.com/w/file/fetch/144412791/the_joy_of_creation_halloween_edition_android_download.pdf
    • https://uploads.strikinglycdn.com/files/f08610fa-96bd-4fd2-8ab3-e6de2db4f840/battery_charger_ssc-1000a.pdf
    • https://uploads.strikinglycdn.com/files/948dbdb9-2c84-4152-9713-a769d82b3e92/16017222448.pdf
    • https://uploads.strikinglycdn.com/files/d5790987-8f8e-4b6f-8ec8-e8572ad671c1/ti_nspire_cas_cx_ii_calculator.pdf
    • https://uploads.strikinglycdn.com/files/880957c3-5696-4b50-9def-e388df9c8bb3/how_to_set_up_an_iphone_4s_without_a_sim_card.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fa.bin
3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 2960 bytes
font_01_sfnt_off0000f27d.bin
d6fabc364cdc7b257861aea27661b5563554d2359257ffa523b9cb4a3644f365		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 5112 bytes
font_02_sfnt_off000103b0.bin
ba866f0bfe3ccdccf1e2c883727ca4d78ba882aacd22612ab81b51e88c61ab72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 11792 bytes
font_03_sfnt_off00012bd1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 4324 bytes

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