Malicious PDF — malware analysis report

Static analysis result for SHA-256 927835d8fa50d439…

MALICIOUS

PDF

70.0 KB Created: 2021-02-17 02:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0759a6eb3a7b293ee23fa25672e508a8 SHA-1: 3456f6028fa54224cf75b28bc6d0b2864335b7d0 SHA-256: 927835d8fa50d4397ab35d29bde077c4e67d9facd73919ec2ee65daf2cf6e747
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO poisoning tactic. One of the primary external links, https://jottigo.ru/wix?keyword=blackboard+trinity+college+qc, is flagged as suspicious. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/wix?keyword=blackboard+trinity+college+qc PDF link annotation
    • https://fovozipi.weebly.com/uploads/1/3/0/7/130775458/pitomavefepe.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/1575748.pdfIn PDF document text
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/4809522.pdfIn PDF document text
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/5e4a0016c.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/1c661bb.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/wajufifenoxuj/bodybuilding_supplements_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/xiaomi_airdots_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/kiduko.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/56681615532.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/cursive_writing_sheets_to_print.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/spelling_test_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/84566527938.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/motion_sickness_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/tifidoxurebakumepimatofup.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/django_bootstrap_4_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/bisigubutafen.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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 5412 bytes
SHA-256: 77f6363652087f979b2020e7a5e341c1e4f68c9cb66041e108e4051ce91ec4df
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 10220 bytes
SHA-256: 93ca60c549edd141de0f9584ec0e289bd2d10468b26f1dade9baa6033879ea8a

Open this report in the interactive analyzer, or submit your own file for analysis.