Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b73c89eae08e7a…

MALICIOUS

PDF

84.7 KB Created: 2021-04-05 13:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a252c282566e5789613ec4bc16c9b8 SHA-1: d084b4ceea3283ca00ea16dafbfcaa7c58673492 SHA-256: 82b73c89eae08e7ab6e3234970c3f8668e45eb9f62338e043178735026bc5cdf
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URI indicate a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=el+se%25C3%25B1or+de+las+moscas+personajes+descripcion
    • https://cdn-cms.f-static.net/uploads/4451229/normal_60658e14c5ad5.pdf
    • https://cdn-cms.f-static.net/uploads/4475988/normal_5fe7968a8b41c.pdf
    • https://cdn-cms.f-static.net/uploads/4418963/normal_60187e257baac.pdf
    • http://doxewoga.iblogger.org/quranic_arabic_course_in_urdu.pdf
    • http://nidikasuzarola.iblogger.org/memorandum_report_definition.pdf
    • http://zuregazezoral.mygamesonline.org/how_to_setup_canon_printer_wifi.pdf
    • https://static.s123-cdn-static.com/uploads/4486033/normal_6001c7279fddb.pdf
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5fdf2516cf5e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20f0b28d-a164-4646-b19f-7ae2de0db148/73977619753.pdf
    • https://uploads.strikinglycdn.com/files/f0d6d06c-7d54-434d-820d-997fb7e6ffd1/analisis_de_la_pelicula_el_mundo_magico_de_terabithia.pdf
    • http://kofaxafogi.myartsonline.com/57844966455.pdf
    • https://uploads.strikinglycdn.com/files/7d824f3d-a8f7-4827-9dc0-d93cdf40152c/honeywell_wireless_doorbell_not_working.pdf
    • https://s3.amazonaws.com/bejokazemur/nebonajilajikivuretaxufur.pdf
    • http://dazigeles.rf.gd/whirlpool_washing_machine_user_manual.pdf
    • https://s3.amazonaws.com/zifilobesumafi/ldr_12mm_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/e99fe275-e7cb-4061-9714-759a030dce2f/a_long_obedience_in_the_same_direction_discussion_questions.pdf
    • https://s3.amazonaws.com/genedonapubefe/corinthian_helmet_template.pdf
    • https://uploads.strikinglycdn.com/files/683d57e3-29a7-4150-8066-32bb2c90a020/mutigokomub.pdf
    • https://uploads.strikinglycdn.com/files/a94e96a1-4879-4d8e-8b06-581b6c54094a/biddeford_heated_blanket_washing_instructions.pdf
    • http://lexojowal.epizy.com/rifokigazedate.pdf
    • https://uploads.strikinglycdn.com/files/0a98cd7a-f3ab-4fb1-9502-aad0636f54ec/degelatikolene.pdf
    • https://s3.amazonaws.com/tuxutedi/kalepeloro.pdf
    • https://uploads.strikinglycdn.com/files/d88d16ad-1f62-4786-8bb9-08a8448af027/94003056699.pdf
    • https://s3.amazonaws.com/pubopelej/gonopeniritewawumovogaj.pdf
    • https://uploads.strikinglycdn.com/files/a48e4715-f8ec-4a92-ac3b-3529d1ddb948/how_to_answer_how_did_you_solve_a_problem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a8e.bin
d01a778106da5052f8f191c4488d161040b57f04a2b9eb2be598c93ed1d620f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 5464 bytes
font_01_sfnt_off00011ccc.bin
870b541f2d5a72295e3175a09273ceaa109041164061a3aa6531c867a7037afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 11540 bytes

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