Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9d7c78c5490b5e…

MALICIOUS

PDF

76.1 KB Created: 2021-04-07 14:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a902c792f521200169475801c42cc20f SHA-1: b5c2b1f00d0f81fefdf45bdc4872249b875a7442 SHA-256: 8c9d7c78c5490b5e1d4f966483e85fe5db1e66b964d39ed466f5fd0cbe741dad
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://midufefew.ru/aws?utm_term=libro+tu+puedes+sanar+tu+vida+pdf+gratis PDF link annotation
    • http://drenajkrasnodar.ru/sony_wireless_headphones_mdr-rf985r_battery_replacementvifzs.pdfIn PDF document text
    • http://tryporte.xyz/39376163591pll7w.pdfIn PDF document text
    • https://dogodomob.weebly.com/uploads/1/3/4/0/134017369/jatosoxamulugigav.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/ed1f4bbc.pdfIn PDF document text
    • http://winefesa.22web.org/french_defence_chess.pdfIn PDF document text
    • http://quickpapp.online/kabaduranoxegadebalaypcg.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/88616467999.pdfIn PDF document text
    • http://rubyshup.space/chicago_manual_of_style_paper_formatmwbvm.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/56ae95aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_aef55c2662fe4e469e6001e649c3c676.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_30fbc35001134e25ac122a340bba2f32.pdf?index=trueIn PDF document text
    • http://bumisalozik.rf.gd/femepokulujari.pdfIn PDF document text
    • http://kudiwalu.epizy.com/46078630786.pdfIn PDF document text
    • http://tipopetudigovib.epizy.com/how_to_pronounce_andrzej_sapkowski.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/wegogun.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_d2286dcaba444ea8abe9b34cfcf0a543.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_d73dbe904cd84eeb94b324558dcd50dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/kesetaxulororejapu.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/febupivilifuxex.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/99031916326.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/amelia_bedelia_full_book.pdfIn PDF document text
    • http://sesufutix.rf.gd/how_to_recalibrate_the_salt_level_on_a_pentair_intellichlor.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_fb9002d052154e8e831f3e020068fb61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/dulotisasajubavafo.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/31929407332.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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 5316 bytes
SHA-256: d24ce5a95302dc573544a2ecdf9145a6323003cb8b2bbbfceba94026ff828bb8
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 12084 bytes
SHA-256: c7c3b49cf23e49c081803af612fab6ab2728e991ecac7f6ba365d28e68d0c3df