Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0497f3dc9b4fc1…

MALICIOUS

PDF

73.7 KB Created: 2021-01-28 21:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8cc7d39b465e47a9a355bc04a82ce3b2 SHA-1: 27a0ccd383aa888a038e5b9209d8e99a69e91192 SHA-256: 5d0497f3dc9b4fc17b7981c76a90bfd04451eb5f6a8549595a374f6bee5615bf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external links points to 'bologen.ru', suggesting a phishing or SEO abuse attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

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://bologen.ru/123?utm_term=mapa+de+america+del+sur+en+blanco PDF link annotation
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/jowusitom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470405/normal_5fce4f825941f.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/jujukazenig.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/fosagoba/44488105961.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/bovaxaseditebabetiranu.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/defefinuponuvosami.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/sazewepogepuvowixovuzetop.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/4013089011.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/tabebawonujalewuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/29022310265.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/39921251813.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/amanush_bengali_movie_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/handwriting_cursive_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/air_core_inductor_design.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/unscramble_words_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/free_envelope_template_for_printing.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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 5364 bytes
SHA-256: 452ffa93ffb29b80205fc526364ef7e40cac36a6a9c518a637bef75d8e4f0b83
font_01_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 11724 bytes
SHA-256: a1ce289cf78b71071585081e8e525d24f2934c75ce7044b391a5089a23798721

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