Malicious PDF — malware analysis report

Static analysis result for SHA-256 3574af5a63f64256…

MALICIOUS

PDF

83.7 KB Created: 2021-04-04 14:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aee7a99c1ae83199ff6e2dfddb3ab56 SHA-1: bc85cde13d0e574cfa76d55e00b6dd2c26581e55 SHA-256: 3574af5a63f6425648e9716866de1b18097dc01fbd873b68e60ce925c30b5e95
206 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The 'Guitar songbook app free' text suggests a lure to entice users to click on these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=guitar+songbook+app+free PDF link annotation
    • https://nivuvibopaxaji.weebly.com/uploads/1/3/4/5/134588818/72386.pdfIn PDF document text
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/e2b1e533.pdfIn PDF document text
    • https://walanugenaxoduf.weebly.com/uploads/1/3/5/9/135964425/zulowokag-jigofetafikijod-wibak-zepesukavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_603e67740018e.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/4bed81050.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/dutabovesoj_tevajajor_kesukebuzepa_kelekovuvopesu.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/tawozusejaropake.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/2513426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_604e236c57018.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/ec4762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_602b93ae9cb97.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/6hc7ioO/zuretulomamed.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/c64c0e1ee4d.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aNgD3qQ/fizevope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_6011ca4cd906a.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/cLOvgeC/pinball_circle_game_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_fdb4df0b27c7438eb98c5b60b9010fde.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_79061e9a481541b09e7abdb4626deaf1.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_43be69bc952342b690f2c645d21854dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d466dd26-8028-4d21-9c57-e66f6deaa174/tom_clancy_games_ps4.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_25574dac6aeb4b59bb77037c9cab1e9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06eb5613-a998-4206-80c4-7f032badfe75/2002_ford_explorer_4.6_fuse_box_diagram.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_352c36b8ebe7428997c1e5d4c9179317.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9439898a-ea3a-4633-9c5a-169ac0fe2cc4/giparegekirivowofesupakot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 5272 bytes
SHA-256: f606d523697ad20a9c47a52628daf9f4a8201150302132f0d09fddd00ee3a8fa
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 11340 bytes
SHA-256: fcb5475b65a88d5dcbe148107d7d3310741a326efb6b3e35c5d18ce945d338e3