Malicious PDF — malware analysis report

Static analysis result for SHA-256 3968c0f353ace28c…

MALICIOUS

PDF

82.7 KB Created: 2021-04-01 17:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cdc16284d0a15349d3cae618fd735159 SHA-1: 8d485f6f4c9b073b9a485f435ed155c8a1d0dd01 SHA-256: 3968c0f353ace28ccc4095c5d79a90f32ea69ca39e69c023b2882da73230c4fd
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=sbi+net+banking+form+pdf+format PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e069b15-c52d-462d-b244-59f2dee737a4/12443349224.pdfIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_6f36240b1e0c41a8b0afc42599c6ff77.pdf?index=trueIn PDF document text
    • http://dibulokesimerog.rf.gd/roririzesevumigetedif.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_5f735190a1d04430853557ff2acf1668.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/balancing_equations_worksheet_answer_key_cavalcade.pdfIn PDF document text
    • http://pavebutom.epizy.com/wizard_of_legend_item_guide.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_28c2f6e8c969408ca757c2e03c6550c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/colocar_assinatura_digital_em_documento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afd131d-9e1a-43c1-a7d7-5849ad6ea199/hampton_bay_12_volt_200_watt_type_vi_transformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8e927a-abaa-4f03-916a-58e12f5d08b3/falasegabapawitelesuwivas.pdfIn PDF document text
    • http://wixukitasezi.epizy.com/reznor_heater_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8772efb2-3d1a-44d4-9148-e0eb5d6a76b1/83166226972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bcab49-2189-4632-8aad-62fd03d24dd1/hp_laserjet_pro_400_color_mfp_m475dw_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bcfb2c3-22aa-4e1c-b916-bf2af96e85a5/how_to_study_data_interpretation_for_cat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 3352 bytes
SHA-256: 91c30e2d1ada78d216450f988df81a9b8af68f06a1eabed5d87816fe5ae9965c
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5456 bytes
SHA-256: 6d374a083255fa06cbeaa076960342a8b4eb896aa5d8c165fd315d06da18f190
font_02_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 11072 bytes
SHA-256: 9060e0140bee1e1ddb267a708451cabe7f01cd42f65af271ab9e023c47e616f8
font_03_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 16232 bytes
SHA-256: d2f72e676a58a683e9ec6268ae1a5ecac38daa122d94109ab8678ed1faec4c33