Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d348b9d97b6e19…

MALICIOUS

PDF

89.4 KB Created: 2021-03-04 13:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82d4fa9cdc1056284581649bf6d56d5a SHA-1: 453630d33a22e549b96d726e3807d2377d6bf790 SHA-256: f1d348b9d97b6e195542c9d6729df419fbf832acbc5bc82d3a91db6518e5cd97
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/award?keyword=i+wanna+iguana+persuasive+writing+lesson+plan'. The document body, though heavily obfuscated, contains text that appears to be a lesson plan title, suggesting a social engineering lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a spearphishing attachment to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crophysi.ru/award?keyword=i+wanna+iguana+persuasive+writing+lesson+plan In PDF document text
    • https://cdn.sqhk.co/munenetifu/e0ialG3/95188164200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fca012f12a75.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/edNjiGD/wanufalezopalaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5ff4bbaf1d378.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/Qheihib/buvop.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/IzghtvY/nerazodovumesarezedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_603f8c771a761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_602758c0361a9.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/bheA68B/rewafasofogij.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/nikon_f50_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5fe0b8240b677.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/jumedemimo/five_nights_at_freddys_2_free_online_games_no_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/metodo_de_ovulacion_billings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1306d20-6bdf-409d-9b5d-68c543911420/87795008269.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/how_to_transfer_a_call_using_nortel_networks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f17183-2538-436e-8ae2-ae09f32e26df/31013922067.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_2a6bf09d627a4ca69ea3d30c7d79e7b2.pdf?index=trueIn PDF document text
    • http://kilarosine.atwebpages.com/43387475520.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/geban.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/adm_pro_cracked_apk_free.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_a46948c93069445aaf443b12ed38931c.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_16ac68c5f164497fbaba9f88a679420a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/35222200246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33d20c0-e36e-4a0e-8438-2575714d3231/dodge_avenger_rt_2013_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce944ce-d152-46e4-ab08-f41c5d56f2a1/supernatural_john_winchester_journal_pages.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/how_to_install_a_bully_dog_tuner.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_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 5076 bytes
SHA-256: 7084b04d49008ad7c0fec09d880a4d9d37f04fed866664d15aa4c263e8106fa2
font_01_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 11008 bytes
SHA-256: 56de9de3aa8b65bb7233535b6b084c9fbd396ed0645e0849c78fb7738bfc581d

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