Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadb271922c05113…

MALICIOUS

PDF

82.1 KB Created: 2021-03-06 18:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dfc6de2c8d16c0e9c5684cdaa4e7a838 SHA-1: e68e9b239e5b8d38196f895f1031fc9db5b4a9d4 SHA-256: dadb271922c0511391762e38ddbc674011b08ab181f0bc66f8edc4d2d87fbfd8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with the primary URL being https://jottigo.ru/strik?utm_term=all+trigonometric+formulas+for+class+11th+and+12th. The document body, though partially corrupted, appears to be a lure related to academic formulas, which is a common tactic for disguising malicious content.

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://jottigo.ru/strik?utm_term=all+trigonometric+formulas+for+class+11th+and+12th PDF link annotation
    • https://cdn.sqhk.co/ziriziwebu/jgieOgd/8_ball_pool_billiard_free_download.pdfIn PDF document text
    • http://keksik24.ru/rojuxitavvhi86.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/W1xhb9l/screen_recorder_with_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/h38he7K/sitanas.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/simple_english_grammar_exercises_with_answers.pdfIn PDF document text
    • http://jadebey-x.com/lujipuvazisukizopitunalelci3y.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/t3hj5sM/how_to_beat_roller_splat_level_30.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/hZzhhWE/36459880248.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/how_to_clean_a_jacuzzi_whirlpool_bath.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegugoleta.onlinewebshop.net/teacher_created_resources_answer_key.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_47b2818d166e453ca73dd36dbf071205.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/kezuvulotaxijagi.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/usdf_intro_test_c_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/20182539465.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/11680004470.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/pablo_neruda_quotes_in_spanish_and_english.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/gokozaguwukapodef.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_4734bd15cc4146fd8a3b4291687bf912.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/vokibeduwoxibabubelow.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/64074416914.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_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 5608 bytes
SHA-256: a62349504fc0ce4f377e8eb31ede214cbe0eab78b55949597aaccf0211c6dfac
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 13064 bytes
SHA-256: 6cdaf37d933e2a058df1f60770fb1634ed5776e51353fc9a8f56fb14aa8b7c46

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