Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa1b6388f09f710…

MALICIOUS

PDF

70.7 KB Created: 2021-02-23 11:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb7df1b2491331903655ceb7220b3e50 SHA-1: 0d9f7cf35cdb70026e2190c31603c25955a42e18 SHA-256: cfa1b6388f09f710482f6f1f205457e189cd7dbf0f71ab47c9281d085bea84fa
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, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational content.

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://jottigo.ru/strik?utm_term=basic+english+grammar+class+10th PDF link annotation
    • https://siketaxugulus.weebly.com/uploads/1/3/5/3/135309361/f946c.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/yjdKCif/litepokekotijorepixewita.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/d0iiGid/colt_express_bandits.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/0c2b6465b1dc.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/iiW6itZ/wrestling_revolution_3d_pc_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/glRAib1/lulegaxepoj.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/sCjgIKw/civil_war_1865_events.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/xeroguru/76009224100.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/vozuzazabagokut.pdfIn PDF document text
    • http://bofetotazefonuv.epizy.com/24829147739.pdfIn PDF document text
    • http://meguwuzib.rf.gd/lonupojogerovajep.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/through_digital_platforms.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/26442703313.pdfIn PDF document text
    • http://bowomufe.epizy.com/atf_box_setup_11._90_free.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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 5456 bytes
SHA-256: 4ae9ced1e97b9e46d94579786b94ec4f389e416793ce81815917d605b2ffa1e8
font_01_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 10356 bytes
SHA-256: 8d863f86c91f409356db4379fbb5a0cd0b502c15fdc7a3dac9c0b4e4057bcde9

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