Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0178f108765b77…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 16:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c7ccfbe5ad370bd4c9615cc9fe96f549 SHA-1: 74c53ceef7ce770e9fe64c63809de1579a4a870d SHA-256: ca0178f108765b774ff54d8b39ee1e6c5da58f34392e7414bd7f6a7f74fcccbb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/wix?keyword=gritty+penalty+box In PDF document text
    • http://larokamexi.sportsontheweb.net/blackmagic_intensity_pro_installation.pdfIn PDF document text
    • http://finonit.mypressonline.com/61448799205.pdfIn PDF document text
    • http://gitilapen.66ghz.com/tegonaritawomu.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/5DlhcnS/ludo_superstar_tencent_games.pdfIn PDF document text
    • http://kiramosowufotir.22web.org/what_are_the_parts_of_the_front_page_of_a_newspaper.pdfIn PDF document text
    • http://buzerudi.22web.org/xufotavivisu.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/manual_unico_de_policia_judicial_version_2.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/djbWijQ/sports_connection_camp_charlotte_nc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wikatamuk.rf.gd/how_to_connect_ihip_soundpods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37249490-70b1-4c8b-9ca9-84d4abd967a9/pilibe.pdfIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/how_to_reset_brother_printer_toner_error.pdfIn PDF document text
    • http://jibufunipibavu.rf.gd/arya_samaj_marriage_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8d3fa7-d63d-4c92-bb9e-cc40129c2f02/thompson_center_hawken_primitive_rear_sight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330f71db-327b-4dd6-8a10-c3e1e7085015/80415010529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a7b244-3d31-46aa-89eb-ee7bef9647cc/65105862810.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/rosogozorol.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/how_did_the_pigman_wife_die.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 4764 bytes
SHA-256: d677844f3be74c9a77c9e1f4f7a1cc79522d89629445823d9b1651834ff48c22
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11200 bytes
SHA-256: 76a28454f3e8ca03ffe10ff92323b5c5f9a2a1e46e7ee08b1ccc38283fdd635d
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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