Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40320fffee3e3be…

MALICIOUS

PDF

79.0 KB Created: 2021-02-16 01:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50fba0fe6760a78c9948ba40aa552eed SHA-1: c6d91b0b7eccc2a669a5ff730d030ce5b2e7ad44 SHA-256: d40320fffee3e3bea6bff2b0d2875898f7e1d66896e19a16265407c747764ad6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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 document body, though heavily obfuscated, contains text suggesting a social engineering pretext related to email replies. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam.

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/123?utm_term=thank+you+for+the+quick+reply+email In PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fec11249cd54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5fcad2e272f03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcc196147774.pdfIn PDF document text
    • http://pabulaluxe.iblogger.org/niziwule.pdfIn PDF document text
    • http://hookup666.site/871254944608nfcc.pdfIn PDF document text
    • http://todayshop.website/9916777737387m79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_6016f66e607df.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/34421495537.pdfIn PDF document text
    • http://gouliwer.online/ritutepamofegejaxu30kie.pdfIn PDF document text
    • http://13millions-warzone.store/tufuvukavususezerotejz4cev.pdfIn PDF document text
    • http://present-mag.ru/oxford_advanced_learner_s_dictionary_freet5h59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/senodiw/78406752951.pdfIn PDF document text
    • http://tejugezefufuli.rf.gd/avery_label_template_5260_word.pdfIn PDF document text
    • http://kuwubuvorij.rf.gd/english_comprehension_sheets_for_grade_2.pdfIn PDF document text
    • http://siduxosezuk.rf.gd/jcp_l_nj_report_power_outage.pdfIn PDF document text
    • http://zakagoxufi.epizy.com/rowixodogamugabujeb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 5316 bytes
SHA-256: 878c9e690cf4ff45485e7f6a8f25b67ace7e859af3558faa75fad9ba43c43224
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 2944 bytes
SHA-256: 0854e157a5ecb2bd8d1c4c056b5899396a4ebdf589cf47b5758c5b3e4d2c306e
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 11224 bytes
SHA-256: 78233dc8baae0d44620561e2d61c70964aee2053c3566465161d24590b6294cc

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