Malicious PDF — malware analysis report

Static analysis result for SHA-256 94af36d28cb8cde6…

MALICIOUS

PDF

80.5 KB Created: 2021-03-02 06:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d33b30306065e5f0dc4c0ac8fb9518e3 SHA-1: 95a3c68aa56d400dd6cb5f5646bde7177eae07b8 SHA-256: 94af36d28cb8cde6575925bf576b6233fb437c7d4af9ef4a573ce5a406d5cf3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL leading to fokemale.ru. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to software tutorials, likely serving as a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=apple+numbers+app+for+ipad+tutorial PDF link annotation
    • https://cdn.sqhk.co/viwiratoposu/Bm4iggi/granny_s_house_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/hggdhhI/pipumo.pdfIn PDF document text
    • http://talerexogite.iblogger.org/21839784058.pdfIn PDF document text
    • http://iminn.ru/mathematical_models_for_structural_reliability_analysisppill.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/UhHuAMa/capstone_homes_prescott.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/9e72907fe26bc.pdfIn PDF document text
    • http://cmb-societe.com/accomplishment_report_for_ojt_students_in_office57rve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafixatoje.epizy.com/hack_wifi_wps_locked_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/baadshaho_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/72169268758.pdfIn PDF document text
    • http://setuvufijub.epizy.com/47250141343.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/temonejujafa.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/apc_back-ups_es_550va_ups.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/wixuzadutologon.pdfIn PDF document text
    • http://nazifaba.rf.gd/volibaxezulupasawaxagifup.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_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 5316 bytes
SHA-256: ca9015fd35acf80453be1a771016ca51a63d90f79129c0805e04578f8dd815d8
font_01_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 11320 bytes
SHA-256: 7b14c566b8d55b34352e3614c7f8dd02c80ce4fbf4d894001a86e2ca29054e4c

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