Malicious PDF — malware analysis report

Static analysis result for SHA-256 3968052c0d015c80…

MALICIOUS

PDF

83.8 KB Created: 2021-03-28 22:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 114829a472d4104f1db8e1e2954e30f6 SHA-1: 160d848a540da1b0bc95e9cb6deaf85357526810 SHA-256: 3968052c0d015c805a48ee0642846449f0b071fd7c651a4c15b91341720dd243
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain. The 'SE_CLICKFIX' heuristic indicates social engineering to trick users into executing commands, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The document body, though garbled, suggests a lure related to converting PDF to images, likely a pretext for the phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://maypoin.ru/award?keyword=c%25C3%25A1ch+chuy%25E1%25BB%2583n+t%25E1%25BB%25AB+pdf+sang+%25E1%25BA%25A3nh PDF link annotation
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/zoxaxinatof.pdfIn PDF document text
    • https://faxegosesu.weebly.com/uploads/1/3/4/5/134528451/jijuxe.pdfIn PDF document text
    • https://ruvipubelid.weebly.com/uploads/1/3/4/6/134608961/pefokuti-dubasigek-voxabuxije-filiko.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/c0c3b8c4e8aa4.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/norugubok.pdfIn PDF document text
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/tefadisi.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/a00b837.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/pozagukoxafeg_joxomixebedu_gakegawux_silavel.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/bradley_round_sink_parts_diagram.pdfIn PDF document text
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/a82fddefe.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/gomilemonisarajerefowubi.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/tajimipojimo/99028989292.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/gosaxekuroteweve.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/redutoxijiponewofomoso.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/11572262791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c42f7c-50d7-4900-a260-4edd1170c7a1/sunanalofulasivudobut.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/fisojomigupafixasonekekej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f84701a-d84c-4ad0-b1a2-1228f05f60c0/varurevufopap.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/paradise_lost_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/fitevuparopol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0b9f10-d79c-4a9e-b550-5b856d4370fa/best_arm_exercises_without_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/super_danganronpa_2_present_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/acute_tonsillitis_nice_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 6164 bytes
SHA-256: 3444c8ae4e63be8ee893f71c9a35bb08f6f03b40ba4c88ecd17749faa2e4493f
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 21952 bytes
SHA-256: 8486a25cd718638741e1824f0e017a2660663199019118e50a5a342074056d91
font_02_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16684 bytes
SHA-256: 2a5c643c6c587a11fb9d404684e33327ab10ef268768097722d2881f4ec07419