Malicious PDF — malware analysis report

Static analysis result for SHA-256 b234655b5e478d39…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 02:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ff6292d581d1eb6c5f321b6877ebce3d SHA-1: 6a6903a013cba629744153b983727886af9a0c3b SHA-256: b234655b5e478d39114848723b79b5507d89ea0ddaaf091a7eaddfe5fad5d1a6
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=criminal+attorneys+near+me+that+take+payments'. The document body, though heavily obfuscated, contains text related to legal services and payment, suggesting a phishing lure. The ML classifier also strongly indicated maliciousness.

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 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=criminal+attorneys+near+me+that+take+payments In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5ff8c147bef66.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/dalik.pdfIn PDF document text
    • http://mail-autoscout24.net/kowinerewqiqo2.pdfIn PDF document text
    • http://kaxiwex.iblogger.org/windows_xp_screen_capture_tool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5ffaab9e965e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fe9002121fb3.pdfIn PDF document text
    • https://lefonoduri.weebly.com/uploads/1/3/5/3/135324857/4288342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_60105f11e2277.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/gerojemi_nilotesajegodoj.pdfIn PDF document text
    • http://leopolds.space/548826021190qeib.pdfIn PDF document text
    • http://spain50off.info/274759004428yu2a.pdfIn PDF document text
    • http://merishwheelrecords.com/60250962977h212k.pdfIn PDF document text
    • http://zesamoa.online/greenland_ice_sheet_hides_huge_impact_craterctb23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_5fd0e1b1308b2.pdfIn PDF document text
    • http://totalcreditcheck.info/vowutevusawapadazwws.pdfIn PDF document text
    • http://organicsss.space/238668412974lny7.pdfIn PDF document text
    • http://info-pages.ru/sinaxafifadimngz0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rapuzivawa.epizy.com/my_cloud_home_desktop_app_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/business_english_dictionary.pdfIn PDF document text
    • http://gedesopow.rf.gd/baron_trump_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/5655118267.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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 5132 bytes
SHA-256: 76a1e73b863c12ab144f54cc6df864718fdaeff304125413693f7b04d027c7da
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10264 bytes
SHA-256: 7970036986c57c7e1ae81c51141ee53d696e0629a4f2d6dc6ad345bfca32d988

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