Malicious PDF — malware analysis report

Static analysis result for SHA-256 4397f8aa081a43db…

MALICIOUS

PDF

82.3 KB Created: 2021-03-04 07:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f2743a074a78d7b0f135b3f16c8c321e SHA-1: 50bcfccd1feef3cd0e5505fb79d4a2a53cca0fc4 SHA-256: 4397f8aa081a43dbc804594cca0ca925981e48138c718fa68a967e13a9153b3d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to dryer sensors, intended to trick the user into clicking the malicious link.

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://soxebez.ru/strik?utm_term=how+do+you+know+if+your+dryer+sensor+is+bad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5ff756ae38078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fc82aa96de1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5ff2888cdead7.pdfIn PDF document text
    • http://akb54.ru/the_book_of_life_songs_lyricsdaloo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_5fd33f1e2aef7.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/jegcgeb/baby_bella_caring_apk.pdfIn PDF document text
    • http://bigpleasure.ru/examples_of_introductions_for_research_reportss3gvm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412154/normal_60066774263a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fe7859c5b866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fcf3b219ace3.pdfIn PDF document text
    • http://wildber.store/82398250029zxmh6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_604020a7197e4.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/74078655102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tavamikilav.myartsonline.com/race_and_reunion.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/pexitot.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_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 5028 bytes
SHA-256: 557a998113638d50befea8839a068fe85e570bec34e83aff8ac97c7e023b0969
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10476 bytes
SHA-256: deec1779edd27818d94d3bdf9e6fcf03ef2cfe666632a9204757dda5987fc062
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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