Malicious PDF — malware analysis report

Static analysis result for SHA-256 b383bd6f7c5b7d99…

MALICIOUS

PDF

87.4 KB Created: 2021-05-25 02:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f931fc676dd6128ff963bdde9a57b9d4 SHA-1: 5cfc24f185e81c013d43c9a57be66245320eea80 SHA-256: b383bd6f7c5b7d99cb69ce3f4b9e055b329d0a2f12e5496885d1c7f2a7ef3caf
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. The embedded URLs, particularly 'https://nipisod.ru/strik?utm_term=step+1+dates+2021+prometric', suggest a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

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 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://nipisod.ru/strik?utm_term=step+1+dates+2021+prometric PDF link annotation
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/7790559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ff0dc4223ecc.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/zuborikim.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/rovunorosigazamex.pdfIn PDF document text
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/xupom.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/5868254.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/640313abf.pdfIn PDF document text
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/mitegijagevesi_pirizemi_jisoda_vomokigeso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_60033fc3a09ee.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/2cd7c92.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/7553006.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/wovisak/fondant_rose_cutter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b7e54e-c6d1-400c-9197-e8996cecb785/finding_missing_angles_complementary_supplementary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/62932131675.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/guided_reading_questions_for_poetry_ks1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e9fd4d-930a-4e1c-8c10-dbabcdab5306/mary_poppins_soundtrack_supercalifragilisticexpialidocious_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/boss_dd7_digital_delay_pedal_price.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/kemobivoxum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0208073-0e2f-4ed4-bead-a543e1912a29/how_to_start_a_sentence_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab44e499-982c-40ee-bde3-03110eb3ad23/most_powerful_quotes_of_all_time.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_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 5616 bytes
SHA-256: c2237643d0beef2ee3c609d80d0e4ed6a1e4c5ce91b3c9d086547a513f2abf73
font_01_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 10712 bytes
SHA-256: 4a4283b4f7bae54fb02e675bf1f7f3084518d50b775edee4140858e0a0b3541c

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