Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cb04126c58921b…

MALICIOUS

PDF

76.7 KB Created: 2021-02-02 20:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ec6dccef84db9c4aae07306ca888006d SHA-1: 2f8f23295e070f771ae81725c8c515d38bcc0d6f SHA-256: d3cb04126c58921b2ce842c875a0d1d9f95eba7c4f7a68e3c98fdfb116afb1e8
196 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are SEO-optimized and redirect to other PDF files, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic firings point towards a phishing or scam campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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=word+whizzle+dragon+answers+geometry PDF link annotation
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/d5b51191dd61d2e.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/f3c75a33a59cb75.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/7edaf.pdfIn PDF document text
    • https://nigoriwidoke.weebly.com/uploads/1/3/5/2/135296580/nigojubarata_tosotorusogamup_tibema.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/kibadigijigasot-juzisaw.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/gcQgdhe/46282539931.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/3jaQ0YP/74728110686.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/7703217.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/lixameta.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/eGB4hbH/snowflake_clipart_simple.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/napote.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/jfha4JE/58475749567.pdfIn PDF document text
    • http://zirosax.iblogger.org/frog_game_japanese_guide.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/2020289.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/rujabepifar/acapella_maker_full_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/jumapet.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/cellebrite_ufed_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/21040049707.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/family_life_merit_badge_worksheet_2019.pdfIn PDF document text
    • http://kitalanexu.epizy.com/gate_fold_template_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/abn_form_for_dme.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5496 bytes
SHA-256: 57c416db08467c6925983fb7d31abd5f8a99119e6b9f244abb1a62a1ccac64e3
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10312 bytes
SHA-256: 74c3bce2c4d6f69bc93b9251c258f36a8ebc51e162d7f7f48a1f6617ec09c7ba

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