Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c8237493f3530f…

MALICIOUS

PDF

71.3 KB Created: 2021-02-04 13:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1a780298d76986d785faa053b61740ae SHA-1: ba10c776ebc237f991a04041caf6a399c7b30ab4 SHA-256: a5c8237493f3530fd0c1a51b24640cd6dcb4ac2c81728e67864fd92b2b2efe3d
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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
  • 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=high+school+sports+awards+categories PDF link annotation
    • https://cdn.sqhk.co/lopumilekana/cjahfgV/pyramid_run_2_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/cTjaYgg/72356200224.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/Kdgjjdp/66123669442.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/gdOnCIb/download_supreme_duelist_stickman_uptodown.pdfIn PDF document text
    • https://jubagidegugidok.weebly.com/uploads/1/3/5/3/135317658/5d41eb5db.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/egcgegh/bulleit_bourbon_winter_cocktails.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/jhfhjPt/tattoo_name_generator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/hatjcgd/japete.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/hiNshck/stealth_jailbreak_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/hfmE2gf/verizon_speed_test_internet_speed_test.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/bulozor/op_amp_circuits_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/16859226971.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/tourismusinformation_berchtesgadener_land.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/vipez.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/discharge_form_from_hospital_template.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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 5388 bytes
SHA-256: b18fca0739720954fb6dc1da96420087664d93cc108f980c3112c69e13ea6f2d
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10600 bytes
SHA-256: 51e973dc0e039a75e90c4487ea33ec00fb89171ce8aeb1a5c5de386ac1f60b7b