Malicious PDF — malware analysis report

Static analysis result for SHA-256 1139783d34950b21…

MALICIOUS

PDF

119.6 KB Created: 2021-05-27 19:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 380de0d3c7a1a4fdf1826a9fee45f273 SHA-1: d30f9bb35ba1d8c9689aa19f21dd017fd165cb81 SHA-256: 1139783d34950b2171c859269c1eda62c3c35e7ce01e7bb26141f1c1ae597cc7
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a PDF link farm detection. The presence of numerous external links, particularly the one pointing to 'seumenha.ru', strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection indicate malicious intent, likely to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=bit+by+bit+%25D9%2584%25D9%2584%25D8%25B5%25D9%2581+%25D8%25A7%25D9%2584%25D8%25AB%25D8%25A7%25D9%2584%25D8%25AB+%25D8%25A7%25D9%2584%25D8%25A7%25D8%25A8%25D8%25AA%25D8%25AF%25D8%25A7%25D8%25A6%25D9%258A+pdf PDF link annotation
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/30ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_60241bf0cd656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fe71382ea3fe.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/susitafukinefo.pdfIn PDF document text
    • https://lemuvizavo.weebly.com/uploads/1/3/2/6/132682731/5905536.pdfIn PDF document text
    • https://nonuradijo.weebly.com/uploads/1/3/1/4/131406562/kogorini.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/b3d1c0bf-e857-437e-8c4e-5a1db83f1ba6/super_smash_bros_ultimate_world_of_light_character_unlock_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38356a4-f0f3-4dd2-98e1-d08d392b497c/public_administration_and_management_salary_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32330027-f9f5-4515-93d0-3e9f6d7dd414/47373589913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459f7663-77c9-4bd6-af9f-0d34e3466e5b/volume_of_rectangular_and_triangular_prisms_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da936787-8547-4c2d-9dfc-7e32d7bb6b25/90689823572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b042b28-a6c2-40df-b207-7b59c55a9569/ati_comprehensive_predictor_cutoff_scores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea9a160-40cd-449b-bfb3-29ba19634c4f/kenmore_ac_remote_6711a20056t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c21261-0000-4b34-86c1-46bcbb92ba86/tasofoxereduzijujim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f292cad-67c2-4eec-9e72-9e861e7eb5a9/facebook_remove_all_friends_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af87f07-93ed-4882-8bb5-05bb983cdfda/how_to_create_process_flow_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e639471e-6dc1-475d-a150-b2c7fa36a3e5/diccionario_enciclopedico_biblico_ilustrado_clie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577b38ab-a551-4d86-baae-f5e6c4341599/simple_house_cleaning_checklist.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00019590.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19590 31544 bytes
SHA-256: 0b5317b2dac8df3e6368ea1f8f3b25e9853dd4ba61df8f9a7bd4c01bb412fdbd
font_00_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 4808 bytes
SHA-256: baa1eefe8b68092b9b260a78dd60185ba658c4a77617a3483350062efe7088e8
font_01_sfnt_off00013893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 10024 bytes
SHA-256: a52009e59b0a866719d8b652cd3c7ca363d896e54c858c57b84be7f22cb2289c
font_02_sfnt_off000158af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AF 10072 bytes
SHA-256: 1751c9a0c9b89ed33cf36619c6c91939ddf8e7fc2f31cb305aff0e48c947cf57
font_03_sfnt_off00017b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B55 17644 bytes
SHA-256: 93a96cc2d6cc5f6e9454365b4205d7658a9718bf43c75c974d3968271b537aea

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