Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1927967ed8ba43…

MALICIOUS

PDF

65.2 KB Created: 2021-03-27 21:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7840f083562a72dfa9e53361eb617c27 SHA-1: 59036befc06d2cee2feb5dc351bd4034a765584c SHA-256: ba1927967ed8ba43127265cdcd8f1cff0d5a1adc9518de8e69c28ff82f15a5c1
156 Risk Score

Malware Insights

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

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 0.9998

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://seumenha.ru/wix?keyword=computer+science+ap+exam+2015+multiple+choice+answers PDF link annotation
    • http://fodokimi.22web.org/cisco_catalyst_2960g_24tc_l_datasheet.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/fimoduk_minisovuzin_rezojexigodeso_sivukowuwupi.pdfIn PDF document text
    • http://nititesosorejiw.iblogger.org/37089138590.pdfIn PDF document text
    • http://jofijuke.22web.org/android_bitmap_rotate_90_degrees.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/ruwajiwobelonel.pdfIn PDF document text
    • https://pexarokozisakim.weebly.com/uploads/1/3/5/3/135313666/megenigonan.pdfIn PDF document text
    • https://tatuwimo.weebly.com/uploads/1/3/4/8/134882860/7d739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepenaxuwijun.rf.gd/neopost_postage_rates.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/8239909355.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_eaeed86f4b864b33bf55dbe0a9706c1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefodek/tom_sawyer_chapter_16_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/performance_review_rebuttal_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/google_play_store_pending_fix.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_14631af965a144e0a1ff91845e2d02e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/zujipej.pdfIn PDF document text
    • http://xofopok.epizy.com/72496313174.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_ebf221b8d86a4305bceda13daa9c9575.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/online_photo_search_software_free.pdfIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_bb1dc9cf9d0e49d9b2f0177d4b808aec.pdf?index=trueIn 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 5688 bytes
SHA-256: b8cb5175432aa185910f2538c8369f088f223a232e8410d38286b4dcc87a0d14
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 10360 bytes
SHA-256: e1b772220a80379eee7eb4f3cec846796804c4fff513c17feea46c46222a70e5

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