Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c775d5007d7ae1…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 21:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: df6bf923f9f9bd08fbe91bf0714298d9 SHA-1: 35d16ae91bfd2d8446594c1e5fb18645eca6b87c SHA-256: c2c775d5007d7ae1e635066e00d7dfe4e98a3d8b9686c44a57c4d24d7bec667e
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that direct users to various websites, with one notable URI being https://xezojetit.ru/wix?keyword=romeo+and+juliet+act+5+summary+shmoop. The PDF's structure and the presence of many links on disposable hosting suggest it is designed to manipulate search engine results or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=romeo+and+juliet+act+5+summary+shmoop PDF link annotation
    • https://cdn.sqhk.co/rawatajizefu/eijjb09/95210090810.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/gJJjgYG/solar_tax_credit_2020_texas.pdfIn PDF document text
    • http://toportt.online/john_deere_lawnmowerpreeq.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/jaihhi8/fuxosesekegirozalejo.pdfIn PDF document text
    • http://deemonatrafik.xyz/lewirerovoruzizenifepohfbcf.pdfIn PDF document text
    • http://pixell.store/zikisatizem02c5.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/dggjixO/zofutalatamajanazakituna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_44f8bda644e84ccba9c939241642c330.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57590a5-4a51-4fa6-b75b-9ea865318384/82286322606.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_3484266135d744f9bd79600a42f2a06e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb19975-1ac2-4a32-97e8-a2501034a46b/60464925211.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_9127f8b7f23541a0bc7892f46c9a4d25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/bike_race_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/bca_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/darapag.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_09d9b79d29754ffe84dcba6415554c2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd61ced4-21d4-4e2c-93fe-be6bdc1c4dd4/serial_key_counter_strike_1.6_no_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803e02d8-46a0-4885-a2b4-d062e72d4d6f/zojegizoxakogexezakosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db39de8-7347-4966-b32c-9ab100d3d008/87951512447.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/august_osage_county_play_character_breakdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650569b9-3f48-4a84-80e3-6ccb68f6f00c/8832695931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0076aaf-6cac-40d3-a27c-47ed4baf415a/48430048256.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5624 bytes
SHA-256: ebd5970e01cb1d45a89e8269f46061915677c4aa4278e3b01138b0aa6b6f6529
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10416 bytes
SHA-256: 70ab390fe073844cdf74c4e4664ec888d3db8b8db6b8c4cca20fe708295809db