Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b2bff74c77c95f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 21:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66cde871758a3e0d8dcd187728ef3a17 SHA-1: e1a5997e6c32e6037a0a5353164c9af9b74d300e SHA-256: 98b2bff74c77c95f46b786ef10ab427c015b354b7e989ac8b6fd383786acacbb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm with numerous disposable domains and a misleading UTM parameter, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lengthening-sldf.com/userfiles/file/75358482837.pdf In PDF document text
    • http://rosniyom.com/userfiles/files/9574648420.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/13319242795.pdfIn PDF document text
    • https://majubesar.com/contents/files/wunokajurujovafojakom.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lopipobotinoto.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/nuvuxumemezugudegina.pdfIn PDF document text
    • https://wrd13.com/force/file/27656450560.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/15980119401.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/78832504179.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/fomozufifejuvixege.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/kugigirajatizakudo.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/kifevasigenatujibojomud.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/tukagemad.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/lamulanalizomixarelov.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/joditimujafidujotugod.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/jirojudodexizobusudinidad.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210922191006650474g12p5.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/gutokodavoxesefopexapi.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/14509488291.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/57475207981.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/vivofizowetegoza.pdfIn PDF document text
    • http://tai-group.com/upload/files/vafixiludazepo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bobogowoxepidizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=instagram+likes+generator+freePDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10600 bytes
SHA-256: d25aa4a8f8ab3addf4498181adbbbf42113c62b054b9035849443a2e10a7edee
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 17964 bytes
SHA-256: 21e010e140cede0dcc6f925a0bce7bbb0460925890b02429784b64ecccbc0857

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