Malicious PDF — malware analysis report

Static analysis result for SHA-256 844a6de38cf07d34…

MALICIOUS

PDF

76.1 KB Created: 2021-05-30 06:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56c3cd1f88b784a248cfeb80ca579ac7 SHA-1: 97af3f313052290d4f75b5ebf4beafd387535ac5 SHA-256: 844a6de38cf07d34e3a9bfeb9468da334c758726092d81370e55d6afeb288828
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=bipolar+transistor+cookbook+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9953c456-c655-4f08-b94d-5a56856a78c5/how_do_i_change_my_microlife_thermometer_from_f_to_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df26e366-041a-4e82-814f-4afdba2f6c96/8665707262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0dc75a6-5430-417d-bbd8-b670a2c8472b/johnson_9.9_outboard_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189753bc-03b9-4dac-9e81-5c174bf3aaff/xr2_remote_volume_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e41b8dc-5f49-4d20-84e7-4807e59d9d1a/18654275685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64426716-4804-4310-906f-ce48fb3ce8cc/hp_beep_codes_1_long_3_short.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030da857-46be-432d-8085-3c61dba3cdf3/4469635554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5bd910-b62e-489d-82e6-984cfbf8227f/proof_of_residency_letter_from_landlord_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbe387a-c3be-4497-8b17-b222923f5d3e/what_is_the_salary_of_air_force_x_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe51b3-4eb6-47c9-ac4a-645c98c4bf10/dell_precision_m4700_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf706e67-a418-472f-b2bc-f23ad5e8f52a/18040249944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fa1e2f-21c5-4441-8b3d-b1048ab110d8/53004512588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c723446-0a54-43c7-a89d-00a64625060b/munchkin_bottle_warmer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c18b10-32c4-4dd8-9b7c-d2040da81018/black_diamond_headlamp_flashing_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0556973b-a7f7-4f54-87fe-b25623bddabe/nulixeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee9e1ec-5b24-40e6-b96e-563e45259efe/sipokikarerebipaweve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbbf412-829b-4181-aabd-334791130021/what_not_to_eat_on_keto_diet_menu.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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 5404 bytes
SHA-256: 37fb25825d94331e63003f3765f48539e37bc8d7e3d82ff586bc961445116ae8
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 10568 bytes
SHA-256: d92e7d206f3320ea0b764821d48abad6426562a273103fc87a22b9c26302b98b

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