Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de9d138c097b456…

MALICIOUS

PDF

88.0 KB Created: 2021-03-04 05:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03bddc62fb867a5430b353176cc739a0 SHA-1: 4846e7b4622918dc3bcf00ba254ff2f37bc6dcc8 SHA-256: 5de9d138c097b4564d7519456dbb40c0c5a16ff6693962fbf620cc9b5e2ab646
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of external URIs and the link farm heuristic point towards the distribution of malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=quadratic+equation+graphing+practice PDF link annotation
    • http://raifaisentgo.online/how_fast_can_a_250cc_honda_rebel_gofxjlo.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/moon_river_lyrics_frank_sinatra.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/tamil_movie_story_script_format.pdfIn PDF document text
    • http://aazzzry.space/tubudexotopexubatekhli8.pdfIn PDF document text
    • http://flathead.us/the_education_of_a_value_investor_bookmzw6h.pdfIn PDF document text
    • http://scoretdho.best/59771558151jx7a9.pdfIn PDF document text
    • http://thehensleys.org/athletics_baseball_live_scores_stats_games_20203ivm4.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/scannen_hp_deskjet_2547.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/tom_sawyer_island_opening_times.pdfIn PDF document text
    • http://xrootunited.com/423774775039zqlz.pdfIn PDF document text
    • http://gaydating.world/bojosomukos3rnw2.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/jopomodilamego/tawotes.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/install_kali_linux_on_raspberry_pi_4b.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/fezemojevafuluzepiwonezam.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
    • 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_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 5312 bytes
SHA-256: 598c2e0fc1afc840e6fde2f0552902ea0dd3d9417960434e3976f0a235f7fcaa
font_01_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 11360 bytes
SHA-256: 81cc339c4be4c44f346248ac527992b7ba3a931ea5012932f89342f990da4342
font_02_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 16248 bytes
SHA-256: 646e066c3bc403b7c542cd2c2948d42c6f5e2bd8257a6acf334fb6a015a308fe

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