Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb23d7d68240e91…

MALICIOUS

PDF

61.9 KB Created: 2021-02-13 05:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0351cf1b93f8b4893175c9515ae3fbff SHA-1: 71b39ed0c5d18f6c9352937dd3fcd03ab62fab9f SHA-256: bdb23d7d68240e914f01f8645ff28a2d495ea7b7a14c274e97b4eb0aa0876a9a
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, indicating a redirection to malicious sites. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier strongly flags this PDF as malicious, and ClamAV detects it as a phishing trojan. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vitamix+xl+parts+manual In PDF document text
    • http://nunajurum.iblogger.org/franklin_d_roosevelt_quarantine_speech_worksheet.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/31940c0ca4b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6026f94d2c522.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/fojetewikukivasitgcs0.pdfIn PDF document text
    • http://basvuruizleme.online/100686591158ehd0.pdfIn PDF document text
    • http://jelelegukawox.22web.org/21879239084.pdfIn PDF document text
    • http://probnik1313.tech/ableton_live_10_lite_project_files68c3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_601d830da3f25.pdfIn PDF document text
    • http://samozanyat.info/kixureleewx79.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/favutujirifezit.pdfIn PDF document text
    • http://cleanup-sale.site/joker_movie_mp3_songs_free_downloada00ov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5fcab6ea048d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_6015415cc59eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gufusogatodogej.rf.gd/android_mobile_update_app.pdfIn PDF document text
    • http://zazisuj.epizy.com/bloody_roar_2_playstation_apk_1._4.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/grade_3_english_reading_comprehension_worksheets.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_off0000b6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F4 4996 bytes
SHA-256: 0975b5e316f01b80f60afa0476077cea5fd4812ed6cf5499c4c5843407120512
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 10224 bytes
SHA-256: 05d8517998f0c8158dc083cec2dc635a4834f59d7d380230028f90ef8dfd5bd6

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