Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95b16ba9453e03d…

MALICIOUS

PDF

82.9 KB Created: 2021-02-16 03:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f17968e66d320a8357c48e124b0623f6 SHA-1: b039f42c845b5a6ce046b8686ace809eb52344ba SHA-256: f95b16ba9453e03de114ec040a97474f1d97c231024b0954b8698bb732c30ba9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to redirect users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to potentially harmful content.

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
  • 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.
  • 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://druttle.ru/strik?utm_term=it%2527s+even+worse+than+it+appears PDF link annotation
    • http://wbigs.space/aha_guidelines_blood_pressurex4e97.pdfIn PDF document text
    • http://online-bestshop.xyz/eosinophilic_esophagitis_biopsy_guidelinesohexm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393499/normal_5ff6b860c26ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5ffb2363e7fdb.pdfIn PDF document text
    • http://furniture21.online/16698277529ptws7.pdfIn PDF document text
    • https://suxavumopej.weebly.com/uploads/1/3/3/9/133999634/96e8fb0d9.pdfIn PDF document text
    • http://qlemelest.online/90116677761krp56.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/wepad.pdfIn PDF document text
    • http://car-test.pro/78913234201b3j4s.pdfIn PDF document text
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/nexotomoge-nitufovijuti-jegemipo-delelejuviwowe.pdfIn PDF document text
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/pesazaboved-dududobuwujewid-miwigazenol-nuzosikovowula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fcff2fc2575d.pdfIn PDF document text
    • http://herss.space/hell_divers_book_wikiwx5t3.pdfIn PDF document text
    • http://coolvdomaion.online/libisimujujumadarudg07q.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/modal_bottom_sheet_androidi7dko.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/gifiz/xubabivuninoxazuka.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/casper_bed_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/velixajeraxeriliwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/avatar_the_last_airbender_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/13424627154.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_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 5000 bytes
SHA-256: 95faaab31253ee8fa2522b6cf10a9744b65f5b3f3fb4894da2e0b10eb6cc56a1
font_01_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 10704 bytes
SHA-256: 70c0012a5348abdfb0600062e5b2ae0746d137432740ef3df1cb2b2ed3233b25

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