Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b4c702b9a92d49…

MALICIOUS

PDF

266.7 KB Created: 2021-06-08 03:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 724e1f66f1d7e769ed41dfb5752acce5 SHA-1: 81ad758b2dc943fa049083df88669edb47f9e3ff SHA-256: 55b4c702b9a92d4914a59a290341cac80131fbc1b10604ac7ac4a9f10ac9ad51
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'infrive.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to an 'agenda'. No scripts were extracted, but the presence of external URIs and the nature of the detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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://infrive.ru/pbw?utm_term=agenda+2019+escolar+2020+para+imprimir+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5ffc7f46809fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5fdc636229949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_602d48b3733ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fcfb7586d818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5fee3386b2767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_6066aa0ec0367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5ff06d155e170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_6054ad1d93efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_6022cbc856c30.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/ba11ea45-1123-4719-b01e-5e40b69999f3/84001008371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54c87e8-3a4e-4eda-b665-ffa5f6619046/vunaliwanade.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/daily_weekly_monthly_cleaning_schedule_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34ac2d4-cebe-45a6-807d-a5864d978281/2004_dodge_ram_1500_hemi_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35afc54e-ede2-44c6-81f3-93edd816fd29/kafuwujazulalikavolija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe958ab-e71b-49f7-b060-a134980825fc/gloomhaven_monster_ability_cards_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a76c419-0c15-4f54-b7ad-8b87914af4ad/42515878508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527fba25-e47d-4eaf-a26b-4134409b809e/guxokanijubaselodoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20175299-b39b-4534-9b61-b0a7879bf2fb/letezo.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/veneja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9562d7-4a84-4dbe-8bf2-af290b166559/how_to_get_in_gerudo_town_as_a_male.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27401ce-c37f-42d8-b983-615080eeb6c4/seluwujizeponomuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4559b8-395f-47f5-9dea-c1d878085647/sararetugaboli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3CC62 5948 bytes
SHA-256: 7c694736e07e516e4c3557b1b02850255defe83f0d060695feae3d9a44a8ea03
font_01_sfnt_off0003e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E089 1852 bytes
SHA-256: be9f5b67fa94008e0a5f7caaf7b588cbb6e0178c1c4d92f68090ae3aeb056397
font_02_sfnt_off0003e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E965 15248 bytes
SHA-256: ad8173ca3418ddb738524a87576ddb4b4d297b382182fff506ac5bb92bf650ea