Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bf3aa058eb2b5d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 02:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e90626c713efd1767b1cfb3890b33b23 SHA-1: dd79c634e4eb5b96abe02a9e9ffb12b4e3153ddd SHA-256: 87bf3aa058eb2b5d76628e98487732438b7a7e395bdbc7a67c37bb67cfc0ff83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing lure. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. The presence of multiple links to PDF files on potentially compromised websites indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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 http://restaurant-lyons.fr/userfiles/file/porogawozavivud.pdf In PDF document text
    • http://sm300159.agchost.com/userfiles/files/22448593524.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/tuxisisevovixuvuwub.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/34905104144.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163054757896.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/40958703574.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/8661845773.pdfIn PDF document text
    • http://videlec.be/ressource/file/wadufawos.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/noburoladulazakazoz.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/36448465983.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/73634627411.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/29588712070.pdfIn PDF document text
    • http://taociren.com/upload/file/210915171642828126zzsghopdgp5t.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/35385260421.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vujurujozil.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16144c97e9f046---9029471072.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/91949238930.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/90639629139.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tuneles.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/68023961936.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/edcfa012467206a68c42c2fc03fd720c/renaserilov.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/98021714828.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/kuwisusafapexifupanuvudo.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/90584653769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+app+into+sd+cardPDF link annotation
    • 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_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 19008 bytes
SHA-256: f55d2c42adb982f546c32b2b41dc153e83cd4d1c41e1e834aa99e1b069350a34
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 10452 bytes
SHA-256: bea3ad42b3ff50e548741f9946fed8d54276b036426e66db8f43783200755d0b