Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d991b8cbed725a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-29 10:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc13c2478022add393337448419e7382 SHA-1: 87551828a9a9ae7f712f9418a00bdb3599ea68ff SHA-256: f0d991b8cbed725a728d6873b6a2f3a603d7a3c5718a9514adbdb112d25bcc26
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains heuristics indicating it is a phishing lure and a remote support tool lure, suggesting an attempt to trick the user into downloading and executing a payload. The presence of external URIs and a link farm further supports a malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=download+snes9x+apk PDF link annotation
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/950792.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/huGhgjj/model_railroad_control_panel_software.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/ewic7ib/zombies_frontier_dead_target_killer_zombie_battles.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/background_picture_editor_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/bujcji5/xopupiridikupekiluwas.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/a47a1db30fad8c.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/bb7c9d230aade8.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://s3.amazonaws.com/bipepezuwed/69197587193.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/dafirofijineribuz.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_49ff7d98b0c244c88c59df8a8f12f372.pdf?index=trueIn PDF document text
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_549763fd72fb489d9f02114f0be04369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusagi/wazowojitiditunigopidanow.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/to_formally_give_up_one_word_substitution.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/design_email_template_online_free.pdfIn PDF document text
    • http://nefijeniwipe.epizy.com/betonidematujojevagexo.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/48055621613.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/letterhead_templates_microsoft_word_free.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_e196722fb6ac4901914e5dde2723e8df.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_a4c3dedb1e614a7592076a7c9d7f8c7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/posedekofov.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/zeloroworudel.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_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 5236 bytes
SHA-256: 127a0e43d2e347092d5ffed59052be47d631042872de12756242d64f16dec3bc
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 6344 bytes
SHA-256: 680caa725ce16eb64fcafaa80346f93ac3d85851b74a0519ca0ddd1954383e0c
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 11384 bytes
SHA-256: 17fef2b629866f129d47529c59c7c80461d9c6c6250f232087c7855946879f10