Malicious PDF — malware analysis report

Static analysis result for SHA-256 b402f3955b44749d…

MALICIOUS

PDF

83.8 KB Created: 2021-05-30 13:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 45a02d09126394626fe25bea17cdafec SHA-1: 5a718d7d943523dd1610d8e8969339c4f81c4e16 SHA-256: b402f3955b44749d68f5c9c58d194f36427b67a1082ddb64d239b8aa1e85fb1b
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 and appear to be part of a link farm designed to drive traffic. One prominent URL, 'https://ponafet.ru/strik?utm_term=agent+sai+srinivasa+athreya+full+movie+online+streaming', suggests a lure related to online movie streaming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://ponafet.ru/strik?utm_term=agent+sai+srinivasa+athreya+full+movie+online+streaming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60141b74b0936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_60018326c6f5f.pdfIn PDF document text
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/safazililuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6047b831d852d.pdfIn PDF document text
    • https://bozofapenori.weebly.com/uploads/1/3/5/9/135965419/rovoxabe.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/4058337.pdfIn PDF document text
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/dasuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_606a13aff19df.pdfIn PDF document text
    • https://xixotileko.weebly.com/uploads/1/3/4/0/134018517/ludabofaza.pdfIn PDF document text
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/muxuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_603d83332df6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5336c76-30bc-4831-a87e-e9d7477e22ee/935152566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e74901-3138-4777-a33f-7046e7123106/45149867761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189ff52c-1f9c-4b08-9a12-ced92f3c784d/gatububuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d58fc04-a0da-4a13-b9eb-736a725cea03/will_autocad_run_on_a_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2bfbf4-104a-4d08-9740-46648d0e8397/oxford_picture_dictionary_low_beginning_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937fc602-6f0d-4a6c-bd5b-0118eadb3551/how_to_add_audio_to_fl_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2999c0d1-bf26-4cbb-8964-9a32da3aba9c/happy_birthday_cake_coloring_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1238ddbd-79ee-4ab4-9052-f9b20b43228a/34822249358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b8cb9e-9d3e-4d8d-aaf7-78b555ea0dcc/how_to_draw_a_body_easy_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74b8255-a6e3-44d8-8bdb-f05b41d7cf00/70322803410.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 5332 bytes
SHA-256: 037649cbef4b859f503894234ec637d27a476abf666848f5c1ecfc8449252244
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 10732 bytes
SHA-256: 72b61e2186ae331cea0f339a87f9f8eac8f8a92526906e44622bb99a0f1f15bc

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