Malicious PDF — malware analysis report

Static analysis result for SHA-256 950cafe1e52d9b22…

MALICIOUS

PDF

80.9 KB Created: 2021-04-03 01:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c8930d9732e0b4b5275f6e03da44d55b SHA-1: ed25a2682917f7137ca45d51d3eb96ee41bc5258 SHA-256: 950cafe1e52d9b22496c2a41f9bfacceec1afcffd0cdd21d6cd8519e18c41595
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jottigo.ru', which is likely intended to host a phishing page or a further stage of the attack. The document body, though heavily obfuscated, contains text related to 'database development for dummies', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=database+development+for+dummies PDF link annotation
    • https://cdn.sqhk.co/wimiwupo/f3jdYY5/gun_range_near_me_open_sunday.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/nigmjiO/betubitun.pdfIn PDF document text
    • https://cdn.sqhk.co/surekepuna/IxgujcA/arcgis_10_free_for_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5ff919a5b6c08.pdfIn PDF document text
    • http://dwatches.site/40650958013z7q97.pdfIn PDF document text
    • http://remontnatali.ru/dunevanodujulidakzvczk.pdfIn PDF document text
    • http://istra-backwater.ru/betufedikf9qt2.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/5kmIhhf/highway_racing_online_hacked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5ff47c47e5b6d.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/muxozuvalubi/70835434525.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/fijurifajudorutiluvim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c61dd7-adfc-48ed-a60d-a86446b4bcd4/65964384605.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/wigizofixonalas.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/75871951000.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/citra_android_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52792a2c-3540-40f5-a762-7bf173e0871f/19361497310.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/10539609653.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/bdd_full_form_urban_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1e0358-4af9-43e6-ba87-6129895f4663/65891180606.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/propresenter_7_audio_not_working.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_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5268 bytes
SHA-256: bb7449500891eb50bf709dd3af8139054569d9a159ff9aca305fdf92608baaa4
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 11164 bytes
SHA-256: 5c497d9ad3e9d408a2238f85c17ed8d1b31560a87c71623bc6064878a29acce0
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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