Malicious PDF — malware analysis report

Static analysis result for SHA-256 071bc7b83793b0c6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 14:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7d4b7e8199aac6081e0da8fcfbcb03d SHA-1: 0405c1b5230ce5ff6fbfd4057946a0a4077c49a4 SHA-256: 071bc7b83793b0c66f328bf00cd8dc9b14993b15d1fd773ad15051cc85a484ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'phone+cash+apk+download' in the UTM term strongly suggest a phishing or scam attempt to trick users into downloading potentially harmful applications. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=phone+cash+apk+download PDF link annotation
    • https://anhhuynoithat.com/asset/files/julutinazu.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/23631977744.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vogizejujolotak.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/rujosajuvemurakuwasin.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/jorafutag.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/jamolefawatudik.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/zaxatexijo.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/vuvaburuwife.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/84716363134.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/vozepuxujuzaxo.pdfIn PDF document text
    • http://canadianrockies.info/files/file/dopaganofanepefonibaji.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/xeteruser.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/37281811958.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132516875f05---xosomamorebi.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/birowutut.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/82901207156.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/ponodadefizidatadimek.pdfIn PDF document text
    • http://ducnhua.com/upload/files/79063891247.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zusetodibexogafeteterupeb.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/xiriraw.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/10393863328.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/14438988823.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 10500 bytes
SHA-256: c3458389a177178b4f303d5441c80104f55eb4528cb6f16f151063a6c5639d52
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 18164 bytes
SHA-256: 076805450c6ba99543baa4ab2d1e246ad6a730532f93a66aee9f736392261fe7
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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