Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4375f485c0fcca5…

MALICIOUS

PDF

68.1 KB Created: 2021-03-17 23:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b492346356537390f6681fe7ffcb38ef SHA-1: e29bead51298613bdf9b9794048761ca34eeb768 SHA-256: d4375f485c0fcca583f3bbd84181166cf3e6870f4975c79ad63597cfbd6c79bc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to various websites. The presence of URLs like 'https://dugedepap.ru/award?keyword=adverbs+of+frequency+position+exercises+pdf' and 'http://pipopituga.22web.org/wuthering_heights_chapter_4_questions_and_answers.pdf' indicates a potential phishing or malware distribution scheme. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=adverbs+of+frequency+position+exercises+pdf PDF link annotation
    • http://pipopituga.22web.org/wuthering_heights_chapter_4_questions_and_answers.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/vedoperoseranof.pdfIn PDF document text
    • https://peretokat.weebly.com/uploads/1/3/4/0/134040551/vobulamem.pdfIn PDF document text
    • http://jobasugemijenas.iblogger.org/which_country_has_the_highest_economic_growth_in_the_world.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/8765bf1f.pdfIn PDF document text
    • https://nurufumetexode.weebly.com/uploads/1/3/5/3/135323779/2380456.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/d0719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/ashampoo_burning_studio_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e7209a-17e1-44f5-886b-b4199df203bc/zegimoluvilowoboru.pdfIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_38cad510375a417faf3b282fcf973467.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a0b811-d20d-4633-ad91-4bfd52fbf603/ten_day_juice_cleanse_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/pa_magisterial_court_docket_sheets.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_5f9cc78cbd1046bebf7cbce82805497f.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_7fd63f262bc2430aae52be4e6889bb94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/dota_auto_chess_guide_indonesia.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_e7f7db7cbb95448ea0976bd2917f71bc.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_bffbd7fa49824481be6f2287bd853a00.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_3d5a78d187264f8392aa7d44f6078e5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a98d7c0-eae9-4984-a2be-6ca40e44017f/pewabilajax.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_9e3f5bd2f9aa4c4b9418f70b35565f71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/basel_3_sbp.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/salicylic_acid_wash_fragrance_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 5392 bytes
SHA-256: dc568b107b0e19f80e2a4805d8fb40916a0a8c7792beef6016d3c158480e24b2
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10424 bytes
SHA-256: 9f89a4ec5e7f1f67853fbbe37be7cdc3a2d37c11b3288c9420e4b8805f52514a

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