Malicious PDF — malware analysis report

Static analysis result for SHA-256 420866b66e42d0eb…

MALICIOUS

PDF

74.2 KB Created: 2021-03-13 13:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cdc0bd629293631b23cb0f01d49e963 SHA-1: 2b9115d3bb587a4bf7e12637618e6b9eb7e8cc8e SHA-256: 420866b66e42d0eb0363f4b43f6ee93248393550134285e9b072cf0f5abcaee4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as book titles, indicating a link farm designed to attract search engine traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a scam. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/wix?keyword=leadership+research+findings+practice+and+skills+8th+edition+pdf+download
    • http://nigoguno.scienceontheweb.net/17552727337.pdf
    • https://cdn.sqhk.co/jakatote/FH8rhh6/cool_funny_sound_effects_apps.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6024a01876821.pdf
    • https://cdn.sqhk.co/kenixidoxexi/Whl3icY/83102104689.pdf
    • http://zitalogeloluwiw.mygamesonline.org/algebra_formulas_class_9.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_60173747056af.pdf
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/4103031.pdf
    • http://mukovasisoro.mygamesonline.org/bartley_gorman_book.pdf
    • https://cdn-cms.f-static.net/uploads/4406782/normal_600f0d1470fb4.pdf
    • https://cdn.sqhk.co/dufubimaru/IVpjaxj/name_the_eight_planets_in_order.pdf
    • https://cdn-cms.f-static.net/uploads/4480590/normal_603590d23dac1.pdf
    • https://cdn.sqhk.co/dagozuwemep/jjoeBhb/global_warming_causes_wildfires.pdf
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/db2f4284db50c.pdf
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6037182c1a1ba.pdf
    • http://fobexugelego.getenjoyment.net/how_to_answer_a_what_inspires_you_question.pdf
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fd31e811ce2f.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/vefaj-tasufume-tetamejel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://molujafit.atwebpages.com/bhagavad_gita_slokas_in_telugu_with_meaning.pdf
    • http://tosabukevosubar.myartsonline.com/madeline_singas_bio.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d452.bin
db501d5fa2c24259dc92a0e291676f41349fea81e38ab41939f6163ef1dde00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5496 bytes
font_01_sfnt_off0000e706.bin
9e388e55cdc453e3b152e10c18214742abfa77bc6bea91a965458d3434769015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 11024 bytes
font_02_sfnt_off00010ccd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 4324 bytes

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