Malicious PDF — malware analysis report

Static analysis result for SHA-256 283366c22137d8e8…

MALICIOUS

PDF

77.4 KB Created: 2021-03-03 21:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f599761a6aee997c5019ed09718aab90 SHA-1: 1d3e61b582811868441ebbeed520de84e038df00 SHA-256: 283366c22137d8e89929d589f890cfd90574832de6572931f63525ffe6e6bc08
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a search query, suggesting a phishing or scam lure. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/strik?utm_term=can+i+replace+my+remote+start+fob In PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/xibixoga.pdfIn PDF document text
    • http://cashfree.store/small_vanilla_cake_recipe_without_buttermilkmo00b.pdfIn PDF document text
    • http://blacktea.space/37006963486g11q.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/2693896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_6008a49b1b9ec.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/8503121.pdfIn PDF document text
    • http://kawlites.online/bixby_voice_command_apkor7ur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_603238f49ce83.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/7778758.pdfIn PDF document text
    • http://phtech.site/21771334734cc292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulebosux.myartsonline.com/libirazexurekif.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/lanujasubikigog.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/decimal_addition_worksheets_for_grade_6.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/43258312702.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/bella_casa_bed_sheets_king_size.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/fotulev.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_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5308 bytes
SHA-256: 3084f23d5b6627c691b86bf5d3b80da14c0b2c7e6289756cf558fe84ec271b0e
font_01_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10704 bytes
SHA-256: 46c2f5aa153d0697d2c15121285a48a0100cde747b77cf5bd8860d7f7de68d28

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