Malicious PDF — malware analysis report

Static analysis result for SHA-256 a977d2f7b97e3982…

MALICIOUS

PDF

72.1 KB Created: 2021-10-03 21:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9898492ed8b3ce945b2effce2421a649 SHA-1: c07f61249127754f58c843a1dec21f0a8a9b753e SHA-256: a977d2f7b97e3982f37da5d3ab0497d7706c767cfd51a27ecf93ef2382fa179e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=normal+heart+rate+of+1+year+old PDF link annotation
    • http://jurabos.nl/include/editor/file/72885655521.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/wimifovodozazoliv.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70187046574.pdfIn PDF document text
    • http://cga82.com/admin/File/88407209158.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/4556886937.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zegivojarovegokuxe.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15682514731.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/jokevewome.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tazopimidi.pdfIn PDF document text
    • https://attack.lt/images/files/30765822730.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/54385164585.pdfIn PDF document text
    • http://schubert-hh.de/image/file/leduzuxikejaxapinuweku.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/puxijipod.pdfIn PDF document text
    • https://rajaunited.com/contents/files/jowejimidozezugovolasob.pdfIn PDF document text
    • http://www.ezmoving.com/file/zubipafonowusodipil.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/18426773554.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/42585937286.pdfIn PDF document text
    • https://upaspor.com/resimler/files/13902287984.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/58446677588.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fawepiteziwo.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pitazuk.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/refovosu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/34102359950.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/kitarof.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fomipomofil.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/36800153786.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109081721198700.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 10396 bytes
SHA-256: 1ed923978a317b0c77ace989e5b3295c96ab30cbcb416eb47621f070c056bb6c
font_01_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 17584 bytes
SHA-256: c94abc0120a31c1a646205fd26c740252f150dcefa42b6f57500f9f73fcfe131
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1