Malicious PDF — malware analysis report

Static analysis result for SHA-256 1139429b94feec9b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 11:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0b63402c5ed1d439c499784e718fcab7 SHA-1: 323dff00bc16f004b9c1df50969adb1071ccf0ba SHA-256: 1139429b94feec9bbd037c45743f04a98ced58b3b95fede73d944e5649ce58db
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=what+foods+can+you+not+eat+on+a+keto+diet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_60380b064ed4e.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/1ihajgv/block_puzzle_jewel_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/9viiptK/word_nature_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/tigB21h/noblemen_1896_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_60446fa6a9ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6016d2db957f2.pdfIn PDF document text
    • http://cenderaoriginator.com/maytag_neptune_washer_repair_partsfs6za.pdfIn PDF document text
    • http://becloud.website/beowulf_y_grendel_online_subtituladaq4pld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c4db98-276b-4b5c-98e6-4f367b4f0ca2/52869992267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3952f4-6fb0-439a-97ee-718b11a2a7b2/general_chemistry_linus_pauling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f57dde-f086-49e4-8902-e84c5568bd0a/what_is_mechanical_engineering_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5f57ae-3118-49cf-9f52-4a1650d0a24f/machine_learning_algorithms_for_disease_prediction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52225d6-8136-475d-9e04-d3e304aca9b1/mokewozopuxuvonutututene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d0f3ad-cf4d-48ac-9cfc-7198e42b6bc5/should_days_of_the_week_be_capitalized_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bc6523-aee4-4e33-b3ce-adab53f1be3a/romance_of_the_three_kingdoms_13_switch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a722b47-45ba-4413-a106-357a8d81eee0/58040681928.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5160 bytes
SHA-256: 6dec4df6dc1fc29ce283abb93bb09ac9b2e68fb64b7148ce041727f07cfd6429
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 10940 bytes
SHA-256: 09af652fbc428b266a4719874b7e1974461f91273dd67fb79edae7b7327841aa

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