Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f9081de0e05a3f…

MALICIOUS

PDF

73.6 KB Created: 2021-05-29 17:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7ee49f83f3d1c47de6240ef677b56ee0 SHA-1: 36c37161871532d28137f8c7c80d7fa299a0f57b SHA-256: 20f9081de0e05a3f392450e9cd509e914351072d36b3009030f795a983579813
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded content, though heavily obfuscated, suggests a lure related to 'Youtube downloader y2mate', likely to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=youtube+downloader+y2mate PDF link annotation
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/9958497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_601dae3f46e00.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/3935266.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/2170068.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/bizolezupul.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/8858506.pdfIn PDF document text
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/22bdfaa5.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/3929476.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/mivapamixaruse.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/bezugi.pdfIn PDF document text
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/1ff2f.pdfIn PDF document text
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/8088603.pdfIn PDF document text
    • https://fujowutel.weebly.com/uploads/1/3/3/9/133997949/6d94c40dee.pdfIn PDF document text
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/bc1d0ce69a933.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/lisukumixoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_6028d095cbf4d.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/mijumenavenopasawe.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/e56d1359-9059-4f20-b166-6a950f9552d7/frigidaire_affinity_top_load_washer_wont_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c517111-fcee-4912-a938-f68deb2b590a/lefasatisax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4de858-464b-460f-9d05-24d6c3dcde61/free_printable_guitar_fretboard_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95021d81-0f7b-49d1-8785-d8d70537ff1f/41339042511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6936d5-ca22-4ec1-986e-356d4ee23a1a/fafokukugogidumewipuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ce8905-3915-4061-859b-58d7804de7ee/semulizivulejokodirovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ddc0d0-7ff3-48da-a34a-c0996bdafa4c/liwufexitudapuxeka.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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 5220 bytes
SHA-256: 277199f2c0e3d742c5d4c8ad184a95a9e2fccf95fe0ed03c57c7e44ebb559b74
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10436 bytes
SHA-256: a8066547d6ceacaafa31775357918b4f953b969c344000c0b4ddddb3ea55dc37