Malicious PDF — malware analysis report

Static analysis result for SHA-256 b595b231c4cebe97…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 06:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e21db55b44f5f744d9dece2eb48ae0ee SHA-1: be799759d77d9e3c81eefac0b206c2b0a65224b0 SHA-256: b595b231c4cebe97110ba8d3bb7fe44eed6268f2beb59e1c6abb0852f8191048
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent link pointing to 'https://pelibifir.ru/wix?keyword=ffxi+mount+zhayolm', suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous PDF links and the external URI firing strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://pelibifir.ru/wix?keyword=ffxi+mount+zhayolm PDF link annotation
    • http://lojapidabud.mypressonline.com/how_to_get_free_riot_points_2020.pdfIn PDF document text
    • http://domofozud.iblogger.org/lewakujizikunodu.pdfIn PDF document text
    • http://limevekobo.iblogger.org/dopivusironikejesanu.pdfIn PDF document text
    • http://wigasubuga.22web.org/averta_standard_extra_bold_free.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/had_better_ought_to_should_exercises.pdfIn PDF document text
    • http://fejixisuburuza.22web.org/voridizomisek.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/gafedupeba/grady_twins_quotes.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/30017066400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68213b6b-5539-4b62-a2c5-87f05e7c0fd7/jufuredenulalexadofajovad.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_5079b958acc64b77916ff9bd053b9c33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/hp_6700_printer_failure.pdfIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_5ec0bc2c3d1540828b57bb2f4c8fa67a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/322cb17e-089a-4b75-9dcc-eedff9111fce/gekipat.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_d8d307307386487c898b7d4b79540ef4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe55cff0-8cc1-4ee7-b155-ee01f00c1447/58211083313.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/degrees_of_adjectives_worksheet_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/60800919277.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/believe_polar_express_trumpet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44e2b29-e816-4b36-8707-8a9d89ccf39f/nujolevozalenolegawub.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_bbf102a5b35946dea80c050de1058836.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_3f510daec038474bbe8320c1ae77ddee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/tamokufuwozevumobuxaseja.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_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 4908 bytes
SHA-256: 90e0d2fd1e4a9d5af9ef75d9e329864c049e71ffada70d986083774542fb79b6
font_01_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10788 bytes
SHA-256: a52d33303f0010c96d270fff4cfd47a37c4f011e71247048402c880d99e8f7c5

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