Malicious PDF — malware analysis report

Static analysis result for SHA-256 517a0b7faeac29f6…

MALICIOUS

PDF

67.3 KB Created: 2021-02-04 08:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 58e80cd9cd3809586eb582ad5294a286 SHA-1: 9449b9b3ae0b5745dd071846586e3aa86c0ee353 SHA-256: 517a0b7faeac29f631eb3ecee14039d942860807457830a54b6d25a29f69432b
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating it is a malicious redirector, specifically designed for phishing. The primary IOC is a link to 'crophysi.ru', which is flagged as a malicious redirector. While no scripts were explicitly extracted, the nature of the PDF and the presence of redirector links suggest it's intended to lead users to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=twitch+tv+common+sense+media In PDF document text
    • http://genoray.pro/cinema_hd_v2_apk_for_iphonedbsz2.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/gap_web_default_security_answer.pdfIn PDF document text
    • http://astrology-personal.online/all_in_one_english_core_class_11_downloadkvzlh.pdfIn PDF document text
    • http://carinsusa.com/star_wars_jedi_academy_mods_single_playerce3si.pdfIn PDF document text
    • http://sdek-24.cc/chemistry_mixed_mole_conversions_worksheet_answerst3ms4.pdfIn PDF document text
    • http://dorightunion.com/cecil_textbook_of_medicine_24th_edition_free_downloadmijpo.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ly1jiWn/final_fantasy_14_ivalice_gear.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/sojuravewi/dulij.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/ropefewojosakale.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/integers_class_6_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/72713838001.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/9446623012.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 5152 bytes
SHA-256: 7e57071a2cf9310f9c0a8ec9f71d88c9e68953e1a10d48aaf11dd956601388d8
font_01_sfnt_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 10540 bytes
SHA-256: 1414bfb819e60b5bc14a1fc0ac6a52b28555fd35e6ab2ff17995e239c9fa8e49

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