Malicious PDF — malware analysis report

Static analysis result for SHA-256 899d1f87960a84c9…

MALICIOUS

PDF

79.2 KB Created: 2021-03-26 14:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2fd48ee2f08654d3f57665c47dbc32f6 SHA-1: e175bf619ca7ee534f95f486d9da19553dffff76 SHA-256: 899d1f87960a84c9381701133e79100f9ecfdc968b20533f16fa4a5730ababa2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm heuristic firing, suggesting an attempt to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, such as 'https://seumenha.ru/strik?utm_term=hamilton+beach+rice+cooker+manual+37518' and 'http://1s.london/pofavinefebukusogutopuz4sk2.pdf', are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=hamilton+beach+rice+cooker+manual+37518 PDF link annotation
    • http://1s.london/pofavinefebukusogutopuz4sk2.pdfIn PDF document text
    • https://cdn.sqhk.co/siripeka/gcLggOH/paint_by_numbers_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_6023edff98919.pdfIn PDF document text
    • http://hermidkovo.info/fejiliwibaju6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_604b202d631cc.pdfIn PDF document text
    • https://womufotijomagew.weebly.com/uploads/1/3/4/3/134351515/zijezisubezofese.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/hcUBbiw/instagram_captions_for_fall_selfies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fdc32da4a14c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_6054853ba19f6.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/polulovasejo.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/6646b3d8-5092-4cf0-be16-4d472688f654/which_book_is_best_to_improve_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508f5ed7-30f5-4b1a-a547-12ba9ffeab49/dutosezakozuxopuwavodejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fc61d2-95c6-4207-b4c7-862683cd11cc/6028636130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9c7bb3-b228-4248-8b06-def734d2bb0d/first_grade_spelling_worksheets_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a1237a-657a-46bb-89b4-2abd3839aa85/nasezijugijitenibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3665ed5b-9e65-4df5-9150-87ef3fdec362/oil_gas_ratio_mercury_2_stroke_outboard_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde1b30f-db29-4967-ab87-13fb4eede296/viniginozawawagomij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a376a7a-8162-40d1-97f1-2f90f104bb05/ruwejuporijefegew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2b5002-3fc1-4774-85ba-53940d9d92ff/sagafodudo.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_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 5640 bytes
SHA-256: 9407d5e746fbfdb91b9a210522526c4e48e40f8acd9e197c27b401c1b5d53837
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 10624 bytes
SHA-256: 440138e814f99498a34dd88dc8ecbbbe741b57509a8d626486f0042384c7d614

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