Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0548efd8ecb3496…

MALICIOUS

PDF

69.6 KB Created: 2021-02-26 14:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 23215813bcbcf126b3dacf79d66e78b7 SHA-1: 4ea282f16bb92ab555c5b42c14d0057ad7a175b3 SHA-256: f0548efd8ecb34964695a00d1bd4839d4cc1538d59f81866e3f5b483d85cbce0
126 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, suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to educational content to mask its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/wix?keyword=keyboard+worksheet+for+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489263/normal_6033938991b4f.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/658403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448992/normal_5fcf183a946de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_602af971c53e8.pdfIn PDF document text
    • http://7lessons.site/zagitevowupafufobogifvcxwq.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/jevugufubegonuz_veditakonoxen_wubuwaredavemez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fd7b172b61db.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/2206842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fcd41a237fbc.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/6593018.pdfIn PDF document text
    • http://rafale.store/macbeth_modern_englishn6nht.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368249/normal_5fffa3dca0e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5fdc193975f74.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/9304046.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
    • https://s3.amazonaws.com/loranoduzuja/le_ke_chutkule_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/42876371472.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_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 5292 bytes
SHA-256: 12dab3d8b027ea0d4f8ed3a6f7629ad2fcc25854b2e7e76d9c0887feb21e0b6e
font_01_sfnt_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 9856 bytes
SHA-256: 5fe9346dc360643fe7c97da8d748bee9ce062ae4bc9219c533b34c0d83d28dac
font_02_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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