Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1256c6a87ea3963…

MALICIOUS

PDF

79.6 KB Created: 2021-02-18 02:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 81858ad7419444b320617786b9a9a2f7 SHA-1: e8858dd245c59d349ad2f3723fe8492e5e282d1c SHA-256: d1256c6a87ea3963cd0fa37892f0936b7cdc3c21e3368b4e2018c237e24a25f6
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to exercise answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=localization+of+function+exercise+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477886/normal_6003b1add42a8.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/50298009427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477620/normal_5fd647b68325e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5ff8b04223b7c.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/awk_printf_format_float.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ffa73127c31f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_601e4e1531629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_6028e49bf279b.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/xaliwalufoguni/26136397044.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/blank_sheet_music_large.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/wallpaper_iphone_x_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/indeed_bookkeeping_test_answers.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/17996492201.pdfIn PDF document text
    • http://poposepoj.rf.gd/vebiropijufibadoj.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/23592845815.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_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 5024 bytes
SHA-256: 358db36f7b5cbe3b24215e447a83ed478c799805492198f44036149039d89584
font_01_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 10240 bytes
SHA-256: 3892a5d5f8a69bd4ac73a86c1c5513426c1dcbc11e68a2964e874c1c0f2ece4c