Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d495100e5757e0d…

MALICIOUS

PDF

169.2 KB Created: 2021-03-30 20:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c5a9519fc9236752137a781c1dc5e43 SHA-1: 04689024cdb6347e00a4726546919154787b107c SHA-256: 9d495100e5757e0df4bdbc93ac8c9c48214c1ac1259cca73ecf0543d431e44fb
104 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified as a phishing/trojan lure by ClamAV and ML classifiers. The document body, though heavily obfuscated, contains text related to 'BBC learning english at work pdf' and the authoring application 'wkhtmltopdf', suggesting a deceptive lure. The presence of multiple unknown URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/award?keyword=bbc+learning+english+at+work+pdf PDF link annotation
    • http://bewizasosu.sportsontheweb.net/badewudamado.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/let_us_create_man_in_our_image_meaning.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/sivuwivojodeg.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/que_es_relevante_diccionario.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/2020_catholic_daily_bible_reading_guide.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/fakufenato.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/xisefowu/aadat_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/medtronic_lifepak_12_biphasic_defibrillator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/suxamamiwoz.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/pivakapeminijamoziwim.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/madirirasok.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/39255781244.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/95041943794.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/42140675339.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/virgil_aeneid_fitzgerald.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/am_pm_full_form_in_time.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/25895428161.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/max_weber_bureaucracy.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_1da8e4ad815f47138908ab2a338daa50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/38393039491.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/domufufabofivupomo.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/gazumetakuzedulaf.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_d269961d9d4c43a38e032668d6a20660.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_0c3e43911521472e9b0fd39da496edcd.pdf?index=trueIn 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_off00025d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D25 5760 bytes
SHA-256: 845f830a10a69953470241e33974fa844b77d72a8eae45ad6b480c671ef93884
font_01_sfnt_off000270d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270D1 11180 bytes
SHA-256: 32e14049d99db453abc5bf6611745d2634682d8ba114f58984515c85e9c31aa7

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