Malicious PDF — malware analysis report

Static analysis result for SHA-256 308f9bfe8ff22a41…

MALICIOUS

PDF

89.1 KB Created: 2021-03-27 10:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 425cdd6d7465bb4c56c3f9a79efe23e3 SHA-1: 83c3d48d9a7ddcd2a813823be23f9ccc09f2e6a9 SHA-256: 308f9bfe8ff22a41863207c663bc725e40db3f15facfd71f5f91db4ade678937
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 0.9988

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://leonvi.ru/strik?utm_term=the+monkey+king+movie+series PDF link annotation
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/2b1f6ce73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5ff4dd9f408b5.pdfIn PDF document text
    • http://ig-copyrightviolation.com/benshaw_mx3_controller_manualj2rwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fd7c28364398.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/fikuzogatufaj-lijejagogonuw.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/rojiperi.pdfIn PDF document text
    • http://poroda.site/38883926422h5izl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_603a3de45200d.pdfIn PDF document text
    • http://yourcy.com/frigidaire_ffad7033r1_70-pint_dehumidifier_walmartkly4g.pdfIn PDF document text
    • http://hesap-al-sat.com/700212964089sf45.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/rasuberegipaxi-boradu-kesaler.pdfIn PDF document text
    • http://topagut.iblogger.org/synonyms_and_antonyms_worksheets_grade_7.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/fogekawegojepikamike.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/ea0cb8f7-f3dd-48a0-9836-46c6870d7492/7th_class_english_book_download.pdfIn PDF document text
    • http://kuwitupufori.rf.gd/ditibajagovok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa50fc3-f640-4aa7-9a2e-0911b7dd6f60/best_app_for_stock_market_news_quora.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_7a68676d71ad4f5aaa3bbfa0ca01c1b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03792c5-a6fa-4450-9637-b072d411a19f/dd_character_alignment_quiz.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_21b332106f7c4ae5b28f745b02a835a1.pdf?index=trueIn PDF document text
    • http://jabelakejirer.epizy.com/72990933515.pdfIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_36e6d7528f2b4e39a545d792b2f0cdd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7189c544-8e1c-4ee5-a58c-92f2e058882b/xixunesotiwiz.pdfIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_6e57c08d47104156aefb66bd8b77e3c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d70007-25d0-499e-bf46-c347fa774e65/the_fall_of_jake_paul_song.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_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 4740 bytes
SHA-256: 72c2c54bf60b4c48a195e544ec85864b412e5b1f2fac54fbfd6d6e936f6179de
font_01_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 11708 bytes
SHA-256: 33a3ce02ef24bc6786b61e2b1caf3ef9c92aa7490eb57eda7c328ffdb147a58a
font_02_sfnt_off000148fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3