Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b122b3ee988b94c…

MALICIOUS

PDF

83.5 KB Created: 2021-03-17 00:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40365bdea2849934a24622701452bd30 SHA-1: 1046c419d7c64d9f15f8ee094c40cd4a2f6171e1 SHA-256: 4b122b3ee988b94c54c1f9489972a4e7f6a45a77a760b400c0b74cd70246071b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://resalured.ru/wix?keyword=photo+quiz+answers+level+pack+2 PDF link annotation
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/xobikifuwit.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/hhdhgij/jepasewefezotijuwuja.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/nOw3hjU/magic_words_book_narcissist.pdfIn PDF document text
    • http://zazixewobid.22web.org/8941066734.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jwUhjVg/snappers_key_largo_happy_hour.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/C5helxA/girlfriends_guide_to_divorce_jo_lipstick.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/h9TtmVk/color_wheel_chart_mixing_theory_painting_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/cdf1UxH/alien_shooter_sigma_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/NFhjheK/37919648068.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/nXXzeij/xonufuvubijofojunuribafek.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/jezemotutikisibelip.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/jhMg0M8/75421773702.pdfIn PDF document text
    • https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/256620c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_7beb7bd4da804969b9ca9b7cdf144576.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_aeb1af1861c547499cb410f58149e198.pdf?index=trueIn PDF document text
    • http://donidojirujogid.epizy.com/41290006989.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/59625859727.pdfIn PDF document text
    • http://jaxuziwemulogel.rf.gd/xibukakojudonarugajajijaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 5544 bytes
SHA-256: c56a56ec05669de5829e7f084f35bcc442e51b6baf71ff8ddce42d38870f1e15
font_01_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 11732 bytes
SHA-256: 4bc2e979d35404faf1480990bdbebe525f7e2ec9b45c0b70a4f1fd43764c2f2a

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