Malicious PDF — malware analysis report

Static analysis result for SHA-256 486739dadd5a9920…

MALICIOUS

PDF

96.7 KB Created: 2021-09-13 08:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4ce5e2b82fdb968818c1fd67bfbb82e SHA-1: ad80ddbefd0c5dbaead1aa01f8fba06a27fc67ad SHA-256: 486739dadd5a992039e99511b5b0f77b6b9a6fb6c86f576343cd84fdd1b92d61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fotojursa.cz/userfiles/file/29706340593.pdf In PDF document text
    • http://j1ent.com/userfiles/file/20210901115441.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/wetugomujizow.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/soduz.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/56838681405.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/40413195559.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/mewesuwogefepugedabukoded.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/62211522298.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/87074236873.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/32678953485.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/56067264471.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/65498130404.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497eeec64---najaleguwibowotinepuwizu.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/pivomogagaxeluburawis.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://studiosantese.eu/userfiles/files/ribogumebidodituf.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xelepedoragikor.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/literelutimatuwo.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/31685932123.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/29242055499.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/mekuzimunexutulotoxu.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/demagofesubalugofima.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210912203202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=remembering+the+kanji+downloadPDF link annotation
    • 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_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 11020 bytes
SHA-256: dfd96b04c2dc6c630472b191d54d5f67e29262711465e60fd40739184a236dcc
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 20992 bytes
SHA-256: 8bb3b349730807e40f79782d05a2578efc71ade5725d51d357543d98f14daab0

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