Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8854bf4e81ea5f…

MALICIOUS

PDF

73.6 KB Created: 2021-01-28 05:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: b2603bfe3f8c91c8b4cc5ba7cb75c527 SHA-1: fa862254eb7c7a0dc57e579fa83c406c6dcc9fef SHA-256: 1b8854bf4e81ea5f1f3d0d5bcfded428f4cb0e56fc0c2bdbe97a4709edfe5fa1
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/shook?utm_term=love+island+season+1+cast+usa In PDF document text
    • http://baykamif.space/programa_de_honores_ala_bandera_en_preescolarvzod7.pdfIn PDF document text
    • http://easy-money-cash.space/javadidatolobijetabexapalnjvfr.pdfIn PDF document text
    • http://xeeewq.xyz/42390343025j4zhh.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/6905070279c.pdfIn PDF document text
    • http://bu-markett.com/brinks_padlock_master_keya894f.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/fhjvt1h/69549222173.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/bdcaeba1300e.pdfIn PDF document text
    • http://idclick.cash/unblocked_games_zombocalypse_2_hackecbiz3.pdfIn PDF document text
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/xoberotagas.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/pibabopuduj/airtel_caller_tune_app.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/74501651416.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/bgv_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/magnetic_balls_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/jebuluzixopazejaxazava.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/digoxesuzurulokopi.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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 4888 bytes
SHA-256: e62effdfecf0a1dcb425f5be4607e762e0ab951c5c871b4342b5a1c0e45c3890
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10852 bytes
SHA-256: 01d07dbbacabc7e1f64d7ddc4d06deaf41f8d3fd3e81c694b986ae99ce907491

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