Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fa7f44456164e5…

MALICIOUS

PDF

77.7 KB Created: 2021-06-17 12:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6be9643c7d6efe1bb29a64c7481d5a7 SHA-1: 0dee93424192197e1b3b92e6524f36b19f60b4b0 SHA-256: f4fa7f44456164e51bab95814f3ad50089becd46855d0f68561a75089ca7b029
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/labuvubid.pdf In PDF document text
    • https://jijovozezara.weebly.com/uploads/1/3/1/1/131163872/65badae96a1276.pdfIn PDF document text
    • https://deluneruniji.weebly.com/uploads/1/3/4/0/134012649/madis-lazezapowuzola-pitaget-ruxefexuzekamo.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/8109635.pdfIn PDF document text
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/9715558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/sq/ugae/~3/-MXWpcYQ7kA/square?utm_term=ales+kitap+indirPDF link annotation
    • https://uploads.strikinglycdn.com/files/85dddfaa-6bf4-462c-823d-6c1fc8b47a48/jupabilamemibalafigagopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f4ed3e-2d9b-4511-abe0-f9b20e6f2ca5/i_pilot_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80c1719-8873-455e-870e-c558a12e9f1f/demasufijejevenof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1dbd9fa-edc5-44f3-aecf-34bca8f9baa5/combine_like_terms_calculator_soup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/583213ca-ed41-4423-bf04-8dd01d447465/showtime_rotisserie__bbq_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69821be7-fea4-4aa4-8b09-a29f0c31164c/accounting_for_governmental_and_nonprofit_entities_15th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbed7d6-c9f3-44de-a58b-d07a8afc3b6b/how_do_i_connect_my_brother_printer_to_my_wireless_network.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c411a5c714e26902270dc4/1623462311570/one_punch_man_2_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afef5a3-4933-4a4d-a2f2-03837bd51b1c/92085619005.pdfIn PDF document text
    • http://wekanivu.pbworks.com/f/25247021211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2988c3c6-bea7-4929-8560-3db3f9c5239d/20415805838.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ca0ec7c8827372952d8a03/1623854792809/how_do_you_make_enchanting_table_in_minecraft.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c6a79613f649bb1d090/t/60c8b8d7ee2bea3810977c21/1623767256876/voxemetame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354e405e-6396-47c4-a081-d012b45f50bc/550_paracord_dog_leash_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201bc643-6d3a-4384-a16d-0bad0e593602/galope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe7049e-b37c-44dd-a8d1-aeb66e0ba26f/how_to_put_arris_tg1672g_in_bridge_mode.pdfIn PDF document text
    • http://lagaxizevuxo.pbworks.com/w/file/fetch/145122549/minecraft_download_pc_free_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c53f64311d375de92f5acb/1623539557016/56419462153.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 5004 bytes
SHA-256: f54bdd6f2eec1819fbacc4b33ac8712abe294260815d460b9ed10f8f0b9eb7cd
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 11304 bytes
SHA-256: 7198cfec7bb913566c3f2f3642988602f0d38441cef931e8b473903f75891920
font_02_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 16076 bytes
SHA-256: 20dc835fdb26e5c8b2bf371a74de3f1f2251d0d540cd54084ecb3d27d8cc4587