Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1da58f6430168d…

MALICIOUS

PDF

74.1 KB Created: 2021-04-01 17:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0353178e96ebe8173faba3de850e64e2 SHA-1: ae9b5a8e085e3b437470f96556a905121d5cebe5 SHA-256: fa1da58f6430168de284ce87caf19fef34198d11304a5c26bca031865ca66252
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to "Carboxylic acid naming pdf", likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/award?keyword=carboxylic+acid+naming+pdf PDF link annotation
    • https://cdn.sqhk.co/wojusipi/gh7Vtjh/dancing_ballerina_brain.pdfIn PDF document text
    • https://cdn.sqhk.co/farukisinu/4jcidgi/60401934125.pdfIn PDF document text
    • http://doweryklkq.space/mulapoximilegov4tqtp.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/gdGIxic/cytus_ii_neko.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/fihaQgd/widajolimolu.pdfIn PDF document text
    • http://ruvetimoroneb.iblogger.org/32161133151.pdfIn PDF document text
    • http://karnaval.host/charity_donation_tax_formiupeo.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jbrjjkI/futajixibofipemusox.pdfIn PDF document text
    • http://betmoy57.com/realidades_2_capitulo_2b_answers_page_444b7dv.pdfIn PDF document text
    • http://jumbochecker.com/fire_and_ice_movie_gifirkvw.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/fefurorobumi/wonewonivogedabawimabup.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/tavowatitu.pdfIn PDF document text
    • http://sufefifa.rf.gd/why_is_my_hp_wireless_printer_not_printing.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/vitonesimepomobi.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/10558810558.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/b_tech_film_songs.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_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5512 bytes
SHA-256: 69c4bdc3fad2c79a8c56b1e21d219357d5811f1f21bc1fdfa5ab789a8e014668
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10244 bytes
SHA-256: 11f937a5f6624280b9de07f99eb6e4cc6d955270d4251bd00e8e44c217914291

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