Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c645240db97265…

MALICIOUS

PDF

78.2 KB Created: 2021-03-06 03:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0f77b0528ada1084ce2e9664ea969982 SHA-1: 4c78331797418f6158dbe9c90ef8a8cc4843cec6 SHA-256: 21c645240db9726545c206bcfa725979e035cb00daad178070c0b17b3afb54d7
116 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a fraudulent number. While no scripts were extracted, the presence of embedded URLs suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/strik?utm_term=allied+hydraulic+floor+jack+hdj2 PDF link annotation
    • http://dufifudusimube.mygamesonline.org/99649528917.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/Y7sSV8H/15281842377.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/Igj9gj9/sasizividimative.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/idhaijN/csr_racing_classics_apk_download.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/kusadevajorozuvitagizana.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/3wh5gdr/96360928330.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/mudos.pdfIn PDF document text
    • https://cdn.sqhk.co/zopinulepa/aggqhdr/flight_club_chicago_shoes.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/d4Kjf1V/lolutirulewuderas.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/jizijSR/68272982644.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/aZjhgf1/nethack_change_tileset.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/what_is_the_seventh_man_about.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/a1UHijO/lukuburodafejifedagoro.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/wofaxil/ielts_listening_test_samples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/1954334395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338fcc2b-e3db-4663-85ff-90b5216a0317/48403744283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4cab5f-80a3-4a21-b4b1-a0eb12827ec7/11259816607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41565f5-39e7-45f4-94f9-ed50f119311e/38479819939.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/galvanised_roofing_sheets_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/what_is_the_coldest_setting_on_a_haier_mini_fridge.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/22114315313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c7e12b-0e4c-4b1f-b14c-242e46520919/how_to_deal_with_diverse_learners.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/55268499157.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/98257672883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729abfa4-2f23-48a2-b071-a1691baf44cd/digital_communication_officer_cover_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/how_to_listen_to_the_highest_quality_music.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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 5292 bytes
SHA-256: 6fd4c984b56ecb7189313db87638838a0d112ead38445c7467a18955162d9479
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 11520 bytes
SHA-256: cfa70b8e08b269600525039ef032929056a420c891486941d1fc50845ebe49b8

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