Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fd1432bae8aff2…

MALICIOUS

PDF

109.4 KB Created: 2021-03-20 17:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b9e8fe888ced2a72e6baa18dbe9fe26c SHA-1: c787d88d76453dd018c05ac7d88ea347ee1f7f2e SHA-256: 31fd1432bae8aff22505decc5a7bec9293ceef9889c252eb0e45cf7e19db8877
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the external URLs, 'https://druttle.ru/123?utm_term=gonorrhea+treatment+guidelines+%25E0%25B9%2584%25E0%25B8%25A7', is flagged as unknown reputation. The presence of numerous links and the ML classifier's high confidence score suggest a malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/123?utm_term=gonorrhea+treatment+guidelines+%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2 PDF link annotation
    • http://vozobatenaw.mywebcommunity.org/10th_new_science_book_english_medium_in.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/8922405.pdfIn PDF document text
    • https://jitugitux.weebly.com/uploads/1/3/0/7/130740190/32c3ff3907e34bc.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/john_deere_316_worth.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/16890.pdfIn PDF document text
    • http://www.opentle.orgIn 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://s3.amazonaws.com/zikeko/14525217859.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/sofexufapen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c0003b-ea1d-45d7-ace0-0eb6bc2ddb70/movizagabizukibibib.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/swift_learn_to_code_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/arcgis_for_desktop_tutorial_data-_s.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/jojexixivitutikinavorone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0abb41-dc19-4b16-a126-da547c34d8a2/canon_pixma_mg5320_error_b200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f324a4-ee76-4043-bd56-1e28b95441a2/define_programmed_instruction.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/cowboy_henk.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/loxozem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71802c5f-c253-40f0-9066-6f8137b5cbbf/zatarowipur.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/free_algebraic_expression_worksheets-_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbba6c9-a74b-4e87-b389-f8d7c7fd8cb8/febufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01fdb011-765f-4e24-9de7-a259c90e2d85/nifovexi.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/absolute_rulers_of_russia_guided_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6990ea6e-0102-4fd5-bbe8-e999569f3ef6/husqvarna_viking_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b17ce15-07b4-44d2-b349-8afbce68639d/why_is_the_era_called_age_of_reason.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
    • https://doi.org/10.3In 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000149a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x149A3 12704 bytes
SHA-256: 7434ac27ac56a6366d3c9e8b386031c2b858e9a42ab789e1be8e2bb18e9c1df8
font_00_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 5152 bytes
SHA-256: 681680f06f22b90dc1fa5a01cfe1360db57d9b04e13909a16e3d76da56c3e7a0
font_01_sfnt_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 6228 bytes
SHA-256: 0fbd635347094b7f8520fdac7ee126662e83bc2306d96d60919cbc5f499d3c54
font_03_sfnt_off00016de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE9 12304 bytes
SHA-256: d5f3dc5195373400cc6354930aa0ef683511d72ec093e22217938639a93362d9
font_04_sfnt_off00019737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19737 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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