Malicious PDF — malware analysis report

Static analysis result for SHA-256 31470931cbe7ddd8…

MALICIOUS

PDF

82.9 KB Created: 2021-03-19 06:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 199b43272ed5a7fd820f3c816fff215a SHA-1: 2574fe2c12548ab2d583c6c43416465bfe3dd818 SHA-256: 31470931cbe7ddd8c2c91be1d9f1ad2136b49b972ac41894c0c46ee5a11349cb
196 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which are SEO-optimized and lead to redirectors. The primary malicious URL identified is 'https://maypoin.ru/strik?utm_term=is+there+anything+low+carb+at+taco+bell', which is likely used for phishing or malware distribution. The PDF's structure and the presence of many links suggest an attempt to create a link farm or distribute malicious content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=is+there+anything+low+carb+at+taco+bell PDF link annotation
    • https://cdn.sqhk.co/fegadosijete/oHxiddu/christmas_songs_greatest_hits_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_602923cf96fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5ff8c80d60725.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/ruwefep.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/tjf4hdP/62736439631.pdfIn PDF document text
    • https://sevokubataper.weebly.com/uploads/1/3/0/8/130814346/fuveregitiz-jixivinor-sixipekepuli-jutatefemoni.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/jgjbKgf/66948199628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fcf2dc3195db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_604784a69211d.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/zowibatev/the_complete_rhyming_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/present_perfect_and_past_simple_exercises_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/dell_optiplex_9020_aio_drivers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/apache_maven_compiler_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/jituk.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/goku_vs_android_17_dbz.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/kogurifofa.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/communication_systems_objective_type_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/badmaash_company_movie_moviescounter.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/fuluxerekave.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/ps_vita_lowest_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/pidipi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5332 bytes
SHA-256: 08255c37442c08b58132ea40ce9fc0de1877464bd730fa3f13f88c989e0ac688
font_01_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 2052 bytes
SHA-256: ed51b0ebd4fde5ef4ac091722a637ff45f7f9295ddfd49491fd26536bd17ce32
font_02_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 11032 bytes
SHA-256: 2f806cda18366c006708e533b01d6b0783e84ebd3ff373c5edb8180d6c682ee5