Malicious PDF — malware analysis report

Static analysis result for SHA-256 491553c74dbf4415…

MALICIOUS

PDF

75.6 KB Created: 2021-06-03 11:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ca62569dc86e59bb8dfd675493491625 SHA-1: 9f5e256f2793c7af6d87c189772cd0817cf602ba SHA-256: 491553c74dbf44159af6730e9cbab1a2127c502f874e0ca8b423bac49194be77
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. One of the embedded URLs, 'https://inwebjor.ru/pbw?utm_term=download+animes+brasil+para+pc', is associated with malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading a password-protected archive, a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/pbw?utm_term=download+animes+brasil+para+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499636/normal_60036328052d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_6011eeef846b7.pdfIn PDF document text
    • https://wemavejuza.weebly.com/uploads/1/3/4/6/134689468/firepulixor_gelaxujirenuw.pdfIn PDF document text
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/78bc1a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_603a80eeb5dd6.pdfIn PDF document text
    • https://pokuzasovud.weebly.com/uploads/1/3/4/1/134108684/minujidifowofabodufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_605dc9b5c1d71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5fcf699c2828d.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/6bab56ed-dfe9-4a49-8ea1-526123d141d2/how_to_find_adobe_cs3_serial_number_on_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8858b11-5eb2-47ed-a62d-e69fed8cbec8/totomamudefix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c1cd2c-b1fa-48da-afe3-174685381e5c/integrated_math_3_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7325f8c7-5336-4f98-971f-d73c7373e899/kufuzenizi.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144455244/42222668807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fdd5b55-f8c1-4596-a99f-80fa975be94f/jusamakikipivalurer.pdfIn PDF document text
    • http://rabopadob.pbworks.com/f/how_do_you_play_happy_birthday_on_the_piano_easy.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144511329/kujapazesevifafomuwake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3451c866-e4ec-4054-bbf1-92e880e4c46b/wukujukidafabure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c641a9a9-83a8-48cd-93e4-ada104401592/happy_birthday_instrumental_guitar_mp3_download_mr_jatt.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144427641/44441507535.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144418512/32413960523.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_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5452 bytes
SHA-256: d6f73d11a660b129d17d5120d85291508fe244454e45f63335cc9da1f1916ba8
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 12944 bytes
SHA-256: 5993cebfda1ab00aad4f49890a6e39470c18d3fd16da1d3a5539b8b0f6e57899