Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d1c45fc1d667b8…

MALICIOUS

PDF

77.1 KB Created: 2021-03-03 19:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9663d5d61dafa680ad2a07fb1e8c4ac6 SHA-1: db273e7a404cb68226a355974768382270976a83 SHA-256: 37d1c45fc1d667b84df94689e638c14bb2e3c2ca106188bf6a196d572fbccb09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The primary external URL, https://seumenha.ru/strik?utm_term=time+capsule+ideas+for+elementary+students, suggests a lure related to educational content, likely to disguise a phishing or malware distribution attempt.

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=time+capsule+ideas+for+elementary+students PDF link annotation
    • https://lesinagin.weebly.com/uploads/1/3/1/4/131454304/6661769.pdfIn PDF document text
    • http://idclick.cash/mivudamekigin8etq9.pdfIn PDF document text
    • http://goodxday.xyz/isaac_physics_answers_c52x2g4.pdfIn PDF document text
    • http://1offpark.xyz/8332077658175dca.pdfIn PDF document text
    • http://runmasten.online/19123696596v9eef.pdfIn PDF document text
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/zafatinaket.pdfIn PDF document text
    • https://notomufibaka.weebly.com/uploads/1/3/2/7/132740278/lidisosanajeri-bevedopuvuk.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/bufexa/17014354789.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/google_agenda_partag_android.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/82577041660.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/4976152393.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/fe_electrical_engineering_review_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/jupujomuka.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/do_lawrence_and_holo_get_together.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/navy_medical_corpsman_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/jquery_chosen_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/free_bluestacks_latest_version_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/south_african_airways_application_forms.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_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 5352 bytes
SHA-256: da342ca13446d1cabc03f2f92be7d571802e4644cca83d42589e6a599d8ef0ea
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10380 bytes
SHA-256: 651bd3c2753a1befd796bcde9e33faaf6960d67b35334b31b9a82c2f7fe643ae

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