Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0483ae8b610671f…

MALICIOUS

PDF

69.7 KB Created: 2021-02-17 23:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: bd7ff4b81b25dd3efab06560cf7f5ce8 SHA-1: 475ee4a30089addebab9a36e29b0290f0eddadf1 SHA-256: b0483ae8b610671ff95ed860109ead051e70a07ca496e2af69ba55ed0d37765a
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains, suggesting a phishing or scam campaign. The presence of a link to 'yafferge.ru' with a search query for a Toshiba manual further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=toshiba+satellite+c55-c5241+manual In PDF document text
    • https://cdn.sqhk.co/levowexesu/ixqggii/guess_the_song_emoji_kpop.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/um4Wgi3/slots_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/jhjRhd5/53800462112.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/p1jiRhh/8646282157.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hfcP0jd/47275863364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_60129914db7ec.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/xapejugobama.pdfIn PDF document text
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/9572943.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/haZU9Bq/89807470374.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jhWLqeN/dead_trigger_2_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/edvjagj/asmr_darling_breakfast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegunag.rf.gd/idioms_worksheet_for_grade_5_with_answers.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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 5460 bytes
SHA-256: f38848c3ba43cf78c3acd5fe210cb03dd5850bb48fafdf588008e2dbc37c7313
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 10820 bytes
SHA-256: b88dcc34148c22ef7b7d3961f951db93126916733080f5601a2274736380bd01

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