Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc8c5b5157337dd…

MALICIOUS

PDF

80.4 KB Created: 2020-12-23 21:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 571652de3d83a08dd1ce5c2c31c0c64e SHA-1: bef0cc57691ae71e021b4d08ef3958989f93c3c4 SHA-256: 9cc8c5b5157337ddf08b85a9c2f4de32ca7f816db0d7644183c05a950e837a7e
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm designed to direct users to potentially malicious content. The presence of a link to known malicious redirector infrastructure further supports this. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • 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://ggtraff.ru/strik?utm_term=glossy+slime+simulator+satisfying+diy+games+apk In PDF document text
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/60b1e068e6cc5c7.pdfIn PDF document text
    • https://cdn.sqhk.co/firimubujosu/Vgcgegi/xisilakeduxerokof.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/gdjcNia/jofatukej.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/jic3jeW/pizisutakewijog.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/2256539.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/igja5ib/racing_games_pc_multiplayer.pdfIn PDF document text
    • https://vomilanusasapik.weebly.com/uploads/1/3/4/4/134478463/wogutuluz.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/falufusu/61525191017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1dcafc-5534-4789-8293-7a466c62c4ba/sozakuzelimosumitatuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9130bb99-98de-4623-b935-86f226f7db50/5668784516.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/btc_exam_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/the_elements_of_typographic_style_by_robert_bringhurst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5408e9e8-34dc-490d-83c2-74f7e2977d03/zatarains_blackened_chicken_alfredo_frozen_entree_cooking_instructions_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c3e55b-b834-48d5-8ea7-f283f55d692a/selectively_permeable_membrane_meaning_in_hindi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 3580 bytes
SHA-256: 5c002525f216d6e9a176930e373cbadea5f43dc9baa90f42027cef1aaabd38a7
font_01_sfnt_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 5556 bytes
SHA-256: 363e5e3a58ade505d9e3b9222a4bcf4fd0b8ac078d4f2ab1529aef35fa1aaeae
font_02_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 3868 bytes
SHA-256: 4aa25305f04a0a651581592c28b7c98c91e552b4779ba3c11ac73f6a52a98076
font_03_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 11508 bytes
SHA-256: 6941f624bcc6713e226de1d9f7e1517e078039665b5c6ad298be689f32eff3e6
font_04_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 17200 bytes
SHA-256: afd561e0964790040891fcca16a08e3c9d37b503eebf2315fc5dfb19346a5607

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