Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a21b90c2723278…

MALICIOUS

PDF

73.9 KB Created: 2021-02-10 14:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: e130c3d571a7b33174387274308dd0b4 SHA-1: 0443773cbb4b06f4262838752d23ae9f3a7d49a8 SHA-256: 71a21b90c2723278e73f5e1880870de7d4fe90d3cb0b1a35e302cd15c3a3fd3e
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=addiction%20recovery%20program%20lds%20pdf In PDF document text
    • https://cdn.sqhk.co/mujexoxa/hfpigdc/91811430476.pdfIn PDF document text
    • http://obmenkalnr.online/nccn_guidelines_testicular_cancer_2017xkmq4.pdfIn PDF document text
    • https://tonakojevidi.weebly.com/uploads/1/3/0/7/130775970/2686511.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/15660713777rj5bm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5fe420586feaf.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/HgdjfTO/drift_clash_apk_mod.pdfIn PDF document text
    • https://bovuxubirike.weebly.com/uploads/1/3/0/7/130738735/juzufuv_vikodulesiw_vakiwaju.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/2926754.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/PBHsFja/real_doctor_simulator_er_emergency_hospital_games_download.pdfIn PDF document text
    • http://tiktoktop.design/ias_37_practice_questions_and_answers2vlm9.pdfIn PDF document text
    • http://visionnew.xyz/art_therapy_jobs_new_york_city8ugxc.pdfIn PDF document text
    • https://cdn.sqhk.co/gorilotinedo/2OidUfl/46070332013.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/752c65fe66.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/mejawiwomak/khasi_film_sa_shisien.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/54649689038.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/suwidekojam.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/black_sabbath_paranoid_full_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/game_template_ppt.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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 5628 bytes
SHA-256: e7db42628a286b60e2cb08e6b5573ca920e52454c555c758d62e09d6d591d49a
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 10104 bytes
SHA-256: eaae3c98f4a54f20c129321286aec97b20b1d9e40283718019b886ae40277ff2

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