Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef830359f92ab5e7…

MALICIOUS

PDF

88.0 KB Created: 2021-01-20 19:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 540a3f4638fa4f66c2b5daeb2d9a278a SHA-1: d26e2af4f9f892ad9e006b5d10288ef192f055d2 SHA-256: ef830359f92ab5e7dd3c9ddfb4fe56280dfc21ceb6aecb4f0a6bd9a5d8baf415
154 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical finding for a malicious redirector link and a high ML score. ClamAV also detected it as a phishing trojan. The embedded URL points to known malicious infrastructure, indicating an attempt to lure the user to a harmful site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/123?utm_term=control+gx+beard+wash+walmart In PDF document text
    • https://cdn.sqhk.co/zijikunu/jgPhgUD/vurupepinimaluguje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5ff27ac5c2c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8ebb3da727d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f9bbc9f51ccd.pdfIn PDF document text
    • http://sofoviwov.iblogger.org/mr_beams_light_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476768/normal_5fe3ab22ba732.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/hgI4lIc/free_solitaire_no_ads_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5f9054ed0655b.pdfIn PDF document text
    • http://rigipufefe.iblogger.org/xudogokebade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f8d1f9734025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_5fcb2e5a1b135.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/ijAvrid/stickman_3d_shooting_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fcc2860493a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5ffdf9702984a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fe44dff7689e.pdfIn PDF document text
    • https://cdn.sqhk.co/navezige/gdmZifb/fovofelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5f9bc1366f37c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gopifu/picsart_app_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/55740528552.pdfIn PDF document text
    • http://gadudadu.rf.gd/sengoku_basara_2_heroes.pdfIn PDF document text
    • http://pekudus.rf.gd/wododurade.pdfIn PDF document text
    • http://bimekikup.epizy.com/gebaliretotavodaja.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 5484 bytes
SHA-256: 907d0f986980d8cc7a4180ff17f410aefb4c9a8175a9f5b589c0091fb48c5a3d
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 5444 bytes
SHA-256: d355c73f940fea4926c397a21f88bfbfd1a416d2f12dcf69c9f06f9a5fbe751a
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10796 bytes
SHA-256: 0a3c3cd8ad8aa23ba66f55ad793877913877e445e92c7ee85c022b4f07c473c0
font_03_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 17224 bytes
SHA-256: 37275ec41c906d5dc3d9d072c5ea4ecbe2e5bec6d3b2278cdda8527ca3a3c7e7

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