Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e9b35b0e58faaa…

MALICIOUS

PDF

74.7 KB Created: 2021-04-08 15:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 80fc3b52b05bfa6a26e50932611ffcfb SHA-1: 2ea3eba27eb3ce821a2a6e3c34e4555d0ad2c781 SHA-256: 91e9b35b0e58faaab9cd75c4d691cbee7213350644ce0c43812d7c3bcdce6e70
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or subdomains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=belkin+n300+wifi+range+extender+setup PDF link annotation
    • https://cdn.sqhk.co/numisezopo/i5gfgjO/belajar_coding_android.pdfIn PDF document text
    • http://italystore.pro/australian_dietary_guidelines_201900g8b.pdfIn PDF document text
    • http://domsale.xyz/brother_printer_hl-l2305w_not_connecting_to_wifihzgl0.pdfIn PDF document text
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/mubovitojeradinebel.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/hi3bfxR/average_cost_obamacare_per_person.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/how_to_install_rheem_tankless_gas_water_heater.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/TXxgcij/capacitor_start_induction_run_motor.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/7748575.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/syllabication_rules_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/eHzhdih/ken_blanchard_situational_leadership_ii.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/5e846c83f.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/644208.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/xunomafupojugaferagasini.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/26269094387.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/nedijowewoded/9126669448.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/molecular_shapes_and_bond_angles_worksheet.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/3055531253.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/lowufipagibo.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 5788 bytes
SHA-256: 318fb40434cca8c0305bb4cae7145fe4209a76d5efb0958565598801f8fa2461
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 10836 bytes
SHA-256: d834a1daaeeabb534aeddb340a0f91733fe4c203f750ad914ae3093a333b811d

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