Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb31335b585b354a…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 03:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a32630edddd3e854ae5ef8a2b8dd819e SHA-1: 503ab9888a2643a50ff69beb5489a7639b632e14 SHA-256: cb31335b585b354a46855773fb68c45eba22b54663bdfe590d67fd4f38355ee5
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it functions as a phishing lure. The document body and embedded links present a deceptive pretext ('Texas sex offender registry by zip code') to trick users into visiting the malicious URL `https://baarspo.ru/123?utm_term=texas+sex+offender+registry+by+zip+code`. This URL likely serves as a redirector to a payload or further phishing 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
  • 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.
  • 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://baarspo.ru/123?utm_term=texas+sex+offender+registry+by+zip+code PDF link annotation
    • https://cdn.sqhk.co/xetilibul/jjHhi01/vozirubatototixakevomaka.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/QicEiiN/7008512243.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/dijh4ij/21468844090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475730/normal_5fef6fcfb53db.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/cjQSZic/kokojegizivesuvepovug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fc7974e213c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_600ba5653c34e.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/hggdiai/particle_fluid_live_wallpaper_n_play_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5ff7736113cc0.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/ifiegfi/27530040359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_601552445183c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500187/normal_6007081ef41a4.pdfIn PDF document text
    • http://talebakela.iblogger.org/it_project_manager_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/7RvIfwG/instagram_downloader_video.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/ghwOCig/82429717429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367927/normal_60043aab141c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000e4f2.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000e4f2.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00011bd6.bin)
    • 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 extracted file (font_00_sfnt_off0000e4f2.bin)

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 5388 bytes
SHA-256: e732c21f7013225e15eae7534e29e107ee6d475a666a3c7b8b1d6af4871ce86c
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10716 bytes
SHA-256: f5df31172261566263addce6e6e93505ea3e24dcf5894c67ce80c241e23112b3
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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