Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7b44b3531a60f4…

MALICIOUS

PDF

81.1 KB Created: 2021-02-11 12:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f9e7022c6b0573e8dcfdd25873aecc93 SHA-1: 53f477d3af57751f28b3026a8825c82159b54e99 SHA-256: af7b44b3531a60f47756e4b124b91d8f22b0796a2f1181c5c4cc5f701a331bce
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an external URI pointing to a suspicious domain, identified as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, suggests a lure related to 'molarity problems worksheet'. The presence of multiple embedded URLs, including one that resolves to a potentially malicious domain, indicates an attempt to redirect the user to a harmful site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=molarity+problems+worksheet+with+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fd643dd87562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fed166e9b099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5fcd096e68fe2.pdfIn PDF document text
    • http://znalomstvavip.site/kirekuvujuziloxavrx.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/1I7KBCw/free_instant_online_crossword_puzzle_maker.pdfIn PDF document text
    • http://itash.space/833654431732ajeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_600ebdb56b72e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5ffbe69d86bbd.pdfIn PDF document text
    • http://murezisafedamaw.22web.org/free_audacity_with_crack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5ffa0a778128c.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/fjaQXhj/96897238610.pdfIn PDF document text
    • http://mybiol.site/36092517859m6aic.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://rojapaj.epizy.com/dibelinarajukobim.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/free_credit_report_canada_rbc.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 5304 bytes
SHA-256: edd791506bf1c5f3ac65ebbd348dffd867756130fbd6054609de9364123ead43
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 5144 bytes
SHA-256: e6ad533d364d0dd79d25d238b828527ff765c70c5fb0936d6997f57e79afdec0
font_02_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 10052 bytes
SHA-256: a68aabece105b015893402e329ed4468e8a0449158424b1c6037188d7032137d
font_03_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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