Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81da2e627cb48eb…

MALICIOUS

PDF

68.6 KB Created: 2021-02-02 07:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6b2f7ec128618403538ed365359c8cb5 SHA-1: 5001caf920576f7393373a2cf1f6514891a49208 SHA-256: a81da2e627cb48ebf001af992921eef781c02b78e61ef1fcf77b1c46943699dd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text suggesting a lure related to 'embedding quotes free worksheets', likely to trick users into clicking the malicious links.

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
  • 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.
  • 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/aws?utm_term=embedding+quotes+free+worksheets In PDF document text
    • http://ch-data-2a8fv9s.pw/56443616152t46dz.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/giiijQR/37531070830.pdfIn PDF document text
    • http://igonlinesupport.com/kaiser_permanente_careers_log_inpqa30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_6017c65033740.pdfIn PDF document text
    • https://cdn.sqhk.co/tomakaxizo/k8NLsjd/sujogokekabo.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/the_vampire_diaries_season_8_episodeeywo2.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/fejalujalepor9p70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_60026047c3c0b.pdfIn PDF document text
    • http://detonic-ro.website/71598706023dy3p4.pdfIn PDF document text
    • http://prodson.fun/pre_safe_functions_limited_see_owners_manual_mercedes5k21z.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/858490920854ee66.pdfIn PDF document text
    • http://whitecheat.xyz/art_lesson_plan_ideas_for_kindergarten5hsun.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/hiehcgd/minecraft_amusement_park_mini_games.pdfIn PDF document text
    • http://cryogen.me/6973705841838t7i.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/Hjbjesp/not_scary_halloween_costumes_for_kids-_girls.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/senodiw/73660893925.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/37605106736.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/brtc_full_form_india.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/lethbridge_collision_reporting_centre_hours.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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 5456 bytes
SHA-256: 039c755dbc9aba4360cde3dcef79856774f6a0f99a8414376eeae2e66db50079
font_01_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 9980 bytes
SHA-256: 04410f5ee6e031ac500ecffff2bc93102db94611d87b8cb8533d84adcd6e1525

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