Malicious PDF — malware analysis report

Static analysis result for SHA-256 a757bf554dca7fc6…

MALICIOUS

PDF

73.7 KB Created: 2021-02-01 21:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5cd7764596b0d42d8e88a46b659d7c18 SHA-1: a94d95a5934afc24c4eb44dcba9e87d5303c90cc SHA-256: a757bf554dca7fc688b6f5ef119b6dc7ebce46fd97bf5b87d1126679eee93364
254 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to network routing, which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/123?utm_term=ospf+set+designated+router In PDF document text
    • http://gamedv.design/venozayiox6.pdfIn PDF document text
    • http://triple-doska6.club/libro_que_viva_la_musica_andres_caicedol0v27.pdfIn PDF document text
    • http://iceteas.space/259671306192vpqz.pdfIn PDF document text
    • http://mon-fortuneo.best/11216584244z7bmw.pdfIn PDF document text
    • https://rawabupabazokiz.weebly.com/uploads/1/3/2/6/132695668/guvararobujok.pdfIn PDF document text
    • http://repochka.site/gudasuxizez7n82m.pdfIn PDF document text
    • http://sobakin.space/miraculous_ladybug_cast_kagami74178.pdfIn PDF document text
    • http://1gusevshop.space/ginurasixalivoed6dg.pdfIn PDF document text
    • http://magnitoli-2ekran.site/ruzabalovajemjvmbv.pdfIn PDF document text
    • http://gapuzenum.22web.org/food_adulteration_advantages_and_disadvantages.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/gixirojozogufux/benedictus_from_the_armed_man_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/gelolojarutejosov.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/94044414631.pdfIn PDF document text
    • http://fobiwuna.epizy.com/candle_light_song_video_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/xolodor.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/lajefof.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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 5204 bytes
SHA-256: af04d17d5b3ea0f25ce282052b377d70fa11e51d05927bcc9f986efcc27bec47
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10940 bytes
SHA-256: f1ee2336e5a612d858fec2bf80222e9119f23e52353b3524a5831dcd27d9415d

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