Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b48b9c4fa3b5d1e…

MALICIOUS

PDF

75.7 KB Created: 2021-06-10 08:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 534852f7f1b69f4562660080add4d8b9 SHA-1: 597aee84e486cc288e34da540504f212070bc757 SHA-256: 7b48b9c4fa3b5d1eea02b937ed119f28aa674b619c1957aadf86e2c4ca19f8e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'ketchas.ru' and disguised as a search result for 'namco tekken 3 play online free'. This suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ketchas.ru/pbw?utm_term=namco+tekken+3+play+online+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379606/normal_5ffa7fa21897c.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/jusop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fc8ce5449b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5fc77a930f1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_60182f22ac9ce.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/kepijaximevog.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/1d1c50cfbb8c52c.pdfIn PDF document text
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/4547011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biselafibe.pbworks.com/w/file/fetch/144802749/popegurotibiwefok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ec613c-0835-4f00-8a84-ba7efbf51fac/how_to_replace_battery_lexus_key_fob.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/volume_formulas_for_3d_shapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175ff897-a4be-4320-bb3c-cd1fea4632ac/zelagisuloviroruvenuzigu.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/how_to_take_apart_a_reebok_treadmill.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/comparative_and_superlative_adjectives_and_adverbs_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3054717f-c5b6-4481-9d75-9dcec9eeedd4/mawevapup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6617aa5-9a7e-4139-9b0f-c02ae6efe4ea/48345289231.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144785868/download_play_store_app_apk.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5284 bytes
SHA-256: a423ce47f5cfdafda1c2caf0cc4ad3d15ad856f1f82a0194a3a05821d8b0e4d2
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 10460 bytes
SHA-256: c1f6c20bf27d2f7fc816376f3b4eca945119fcfddc5dbffa01e0b924f6ff94c0

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