Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fabc961f5ab942…

MALICIOUS

PDF

137.9 KB Created: 2021-04-06 08:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c4575991e82c17a977b04d0b7ae457b1 SHA-1: 0e123ad67e931c937c46297b710217d0de06267a SHA-256: b0fabc961f5ab94245f2b45d57500f4f4ef3d44f75b5977ba9ec964d26a82e81
252 Risk Score

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=inglorious+bastards+gif In PDF document text
    • http://dnepr24.info/geek_auto_parts.comlr4xb.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/2e4a3afe30.pdfIn PDF document text
    • http://milano-moda.space/laxobagiwerasukejovijrk04z.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/bamikasagebolugile.pdfIn PDF document text
    • http://trells.space/les_miserables_piano_sheet_musicbz9mw.pdfIn PDF document text
    • http://vnatural.space/do_you_need_a_dvd_player_with_a_smart_tv8612u.pdfIn PDF document text
    • http://exemplpusj.com/rumibobejokavilaxirotz1b8y.pdfIn PDF document text
    • http://openchambre.xyz/ambient_music_samples_freeofsv5.pdfIn PDF document text
    • http://iblack.space/rakuxufafenilukazavobotdmoep.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/lemapixizadodar.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/289cb669adf4.pdfIn PDF document text
    • http://znakomstva69.space/wamofeoavrl.pdfIn PDF document text
    • https://zomujowedava.weebly.com/uploads/1/3/4/6/134629266/nomite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01f5aa1-0836-4b7b-9647-ebe325d9a45d/how_to_remove_battery_dyson_dc59.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_ddc7d27a25da441d8da430fc645d7d23.pdf?index=trueIn PDF document text
    • http://rinodeginozur.epizy.com/alt_code_list.pdfIn PDF document text
    • http://wivonuwexewixir.rf.gd/what_temp_to_convection_roast_a_turkey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1c55de-facb-4139-b102-46a019fd2783/fisher_paykel_single_dishdrawer_installation.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_e39c1a437dc04a0c97eb9ede9840e4e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0d258f-a273-4d55-b98f-eadc58e4bcb1/63102851390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77be2529-9e7f-4d2d-a3a0-bb792385106b/40606602816.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_off0001e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E181 5152 bytes
SHA-256: 74402a640bdbd1e0dc40b21d389ca97a561e68101a9e887084cc391a9eede0d4
font_01_sfnt_off0001f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F316 12116 bytes
SHA-256: daab67e8e8165de6daff4597247d30aa51880427913824beab7fb2decb132a67