Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd05a61032e3382…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 22:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9dd0e13ad5575cfd725252fb16c6719f SHA-1: 1fff16ad10b641e91d8af2dc3b98969cfa7cfa38 SHA-256: ecd05a61032e33827c1038646938bd9e2f6b79229e8af826e250a495dfd877ff
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a page ostensibly about resetting a medical device, likely a lure to trick users into clicking. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+do+i+reset+my+respironics+cpap+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443578/normal_6046476599efb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_60045107a5df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_60498cc71b342.pdfIn PDF document text
    • http://uscarinsurance.info/zomasazumusavuj8z96t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fe0ecc0d1c79.pdfIn PDF document text
    • http://dronextactical.xyz/zasoxebobilagubiraxefalhw3xf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_604120789bf15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/115ded5a-606b-46d5-ac15-dac67e6ee727/zakigigisokefip.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/laxelogovitev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cd89e1-69ce-411f-96ae-67c34844cd2b/77587604057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e86eab-77ef-4a13-817f-7f6b9f413b46/puponobos.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/how_to_open_lg_washing_machine_top_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6adb6f-5a6f-4900-9e63-18707a4b1720/jbl_xtreme_2_connect_to_charge_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe188ad-6485-4e7e-90c5-0d3fc61f57be/60817408233.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/gobugufar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23c41f6-2302-4ff8-9164-89fcf5bffe0b/what_colors_are_positive_and_negative_on_a_phone_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/rivuvagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d141502-1bf7-4320-8488-5465c525d942/10-day_green_smoothie_cleanse_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddde40f-b710-48aa-97b7-b3ed52b9e72e/57946815281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd820cf-10c3-4373-b538-24a5df07ee1a/what_bulb_goes_in_a_garage_door_opener.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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5436 bytes
SHA-256: 487a1ae88a8d5f9f3f5e713fd23b628926a0d876858e179502ef0bb859930b72
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10656 bytes
SHA-256: cbe14d6eee8d6494665aec1102818070c26b0b4844b6753c93ef277baaee62dd

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