Malicious PDF — malware analysis report

Static analysis result for SHA-256 434a4766e73f614c…

MALICIOUS

PDF

80.1 KB Created: 2021-01-01 04:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 43c9ca6dbe6c298d2422c7e88f3b91e0 SHA-1: 543ca0df6ff4bd4873e63d5f73fe2e8eec1d0405 SHA-256: 434a4766e73f614cb2ae7609d91ac2bf61d8dcd45c7e7c04fa5c69212a33bd24
164 Risk Score

Malware Insights

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

The PDF contains a link farm and an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a search query, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://traffset.ru/strik?utm_term=street+kungfu+king+fighter+apk PDF link annotation
    • https://cdn.sqhk.co/regavebike/0Rgeggs/fokobenovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460972/normal_5fd1fe1a764db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5fbf3ddc4c0cd.pdfIn PDF document text
    • https://wezukanedipewor.weebly.com/uploads/1/3/4/6/134602888/lufumawule-wagusiwidat.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/WmNjaji/lego_batman_beyond_gotham_free_android_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/90106561-daa4-44e2-8f70-79b67bdab2f4/kikulemibolewufofotilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec33f4ed-f399-492e-99f5-e6311f53d55c/muxebugonixedodaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/mixed_tenses_passive_voice_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/moxeresujo.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/gufowuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5e1711-e3a6-4066-b562-aca5fa91e662/10049988566.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/royal_purple_10w30_synthetic_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dc0cfc-0ee2-4538-aad0-dc2fa6d32737/2151902615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8107d420-9345-4fb0-b06b-04e848a9813c/28381491098.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 4888 bytes
SHA-256: 97b24c33b2aad7d30e9a020a2c438f8e35566c9d984b69859dee39ab1102e4d2
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 5120 bytes
SHA-256: 099261b431ec72901c717eccecf620607b07cb1b5a0cfba18430627b445ea301
font_02_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 10724 bytes
SHA-256: 2fbb7540df70683ea87060768687b4105b439f8996c38340f9cc8c813cf5e2f5
font_03_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

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