Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fa4f8e7c5acf5d…

MALICIOUS

PDF

69.6 KB Created: 2021-02-18 23:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3f844c59d8a20f5aed8a5f3553a7ebf4 SHA-1: a253a023ca88d6a1f699e5751d323c26b482ab9f SHA-256: b1fa4f8e7c5acf5ddb797b2fde5ffb028565bf33e720a16ad18becccda597fdd
194 Risk Score

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://yafferge.ru/wix?keyword=kelp+crab+oregon In PDF document text
    • https://cdn.sqhk.co/xomorenut/MjaHcpB/smashy_brick_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/Gihfy5F/pick_a_brick_cup_lego.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/ggmYhay/grimms_tower_stacker.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/sWXRheV/retroarch_tutorial_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_6007d1464ee3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topasirerawo.rf.gd/big_old_factoring_worksheet_answer_key.pdfIn PDF document text
    • http://bekujosekufeto.epizy.com/binge_eating_disorder_books.pdfIn PDF document text
    • http://nexuvojof.epizy.com/custom_size_bassinet_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/acog_guidelines_intrauterine_growth_restriction.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/armed_heist_mod_apk_1._1._19.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/wugaxasi.pdfIn PDF document text
    • http://faxumev.epizy.com/62859667098.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/black_panther_hd_wallpaper_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/sawozalaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/hd_bollywood_movie_free_website.pdfIn PDF document text
    • http://vesebebiwimana.epizy.com/nozil.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/buwisotu.pdfIn PDF document text
    • http://buzaduvopixu.rf.gd/pulurinikopomaxoregobobe.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/46042509830.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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 5032 bytes
SHA-256: bc8ed9a182ea72161167949fbe2bba5eee4c20b6cb1c4bac1ff8c733dba36df6
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10372 bytes
SHA-256: 4d437485f6156cfe5da05e07fbf1c9fc43e38cb09d232d59f9811c73bfef5d27

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