Malicious PDF — malware analysis report

Static analysis result for SHA-256 9497d48c03320c57…

MALICIOUS

PDF

92.2 KB Created: 2021-02-17 13:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bbfc5bc1a2775fdc32d6c02254d5cc08 SHA-1: 9a283e626dfbc5ff271aab2764c9dc2066f56710 SHA-256: 9497d48c03320c57ecf6bd95a8d12bace93fffa8a52d2770b2a324aa4cefb5d3
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains text related to purchasing items, suggesting a phishing or scam lure. The presence of multiple links to disposable hosting and redirectors indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+buy+dog+dank+memer In PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hwZhWia/xegarazozetu.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/clN1k9a/jifedidovaziziwe.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/hrjhUgc/90003045838.pdfIn PDF document text
    • http://redirunna.xyz/andy_free_32_bit30gdy.pdfIn PDF document text
    • http://takimopunize.22web.org/calloc_malloc_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/e54sJjf/54467261824.pdfIn PDF document text
    • http://honey-love.ru/plastic_bottle_house_constructionqcijo.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/lvhajgk/gavuzoxevumutisekago.pdfIn PDF document text
    • http://regvoolkim.website/nerisnmpjg.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/6hi0Qjg/91931058876.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/iF82iLp/school_of_dragons_membership_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/cNaAjjF/best_performance_tuner_for_6._0_powerstroke.pdfIn PDF document text
    • http://zalavsky.ru/27240853892dmori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lexuwusifo.epizy.com/free_invoice_receipt_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/chrome_selenium_webdriver.pdfIn PDF document text
    • http://jigiwema.epizy.com/4636571233.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/88523784853.pdfIn PDF document text
    • http://gotakedadonere.rf.gd/mumupogosu.pdfIn PDF document text
    • http://fujalur.epizy.com/muxiposukuzijerajupo.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_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 3772 bytes
SHA-256: 5f78a61fef28e6dc0eb04832617cad707be42af20480d6e78980346b41d7ab8f
font_01_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 5292 bytes
SHA-256: fcfbd9b801ab34d0f124722deb2b6219a34fb8aaf55da5dcf1d7468ed100ae55
font_02_sfnt_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 11624 bytes
SHA-256: 51b01cc2d3ec2d1db2351b70155cedc9d0e38a1556f7305c9b88772c38f07da0

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