Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3910f7e78d6df0a…

MALICIOUS

PDF

70.5 KB Created: 2021-02-23 02:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1e7e993ffd9e8c80136327fb9932e7da SHA-1: 9888832ae50befca0139e0624ab52eae99a0f593 SHA-256: b3910f7e78d6df0a6b11ea706388f52e82c9c2b262ec796290797914f61e30be
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to thermostat overrides, likely intended to trick users into clicking the malicious links.

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://crophysi.ru/strik?utm_term=how+do+you+override+a+thermostat In PDF document text
    • http://gawoxubut.22web.org/13702897969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_6025a2cc934f5.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/aa56eb7ecd.pdfIn PDF document text
    • https://mimifutugeteze.weebly.com/uploads/1/3/0/8/130874087/xokasejosogebini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff77f89e6ad1.pdfIn PDF document text
    • https://molejurat.weebly.com/uploads/1/3/0/9/130969116/sivarelivaxe_povelig_pusukodaxone.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/184860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonolukover.epizy.com/69830963205.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/anti_slavery_policy_statement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/data_analysis_tools_free.pdfIn PDF document text
    • http://bujuxuvumelijet.epizy.com/osmosis_and_plasmolysis_lab_answers.pdfIn PDF document text
    • http://ruxomipeb.epizy.com/school_academic_calendar_template.pdfIn PDF document text
    • http://rumavajusugeg.rf.gd/achyutam_keshavam_song_in_female_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/arifureta_novela_ligera_volumen_8.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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 5248 bytes
SHA-256: fcd37ccf959e5033f22fbe56b75da9d78d5cf6425a10bbd5769886433e3c437d
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 10580 bytes
SHA-256: a1d7d513afe0242862eaca1029c4a4935d23ab03c287c96fdb16f9eaf61bbb0a

Open this report in the interactive analyzer, or submit your own file for analysis.