Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef66800cd386f7e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 14:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1aad5588869edddc2b0949eb51d199ea SHA-1: ec902777443bcc78f0744a92233128c111e11452 SHA-256: 0ef66800cd386f7ec457ceebb52332d867cbcf2ee5c79e5c38a985261f7dfb91
146 Risk Score

Malware Insights

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

The PDF contains a high number of external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://buzascsaba.hu/userFiles/file/9322876680.pdf In PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/gokopidowubupupunokuzo.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/78319077985.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/mebuto.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250919338298.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/18473301166.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/47943946859.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/96684357818.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/jijulafozajimodobizufos.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/mokosabevawiwewatines.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jugukopuwijugek.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/guniji.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/wofemuzinezogugoxilogu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xotajagixe.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210831231136-safovekorasuj.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/19633172248.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/rajemesigatadutaja.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/25562061408.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/93589085030.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161469dc74bae9---datavubozojebafuzazevagoz.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/suziranar.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/pesosixalawoniruvukawe.pdfIn PDF document text
    • http://terminsk.by/pics/files/kolinatudofitezuvuxopek.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/59423115091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+note+10+vs+redmi+note+10+pro+vs+redmi+note+10+pro+max+comparisonPDF 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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 11016 bytes
SHA-256: 7057efda12b6e9a5dd3de7a66ace4333e2ed0392ac95a33ebb5c86a6aff5cfcd
font_02_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 16176 bytes
SHA-256: f3c8d248f972a854849085b8ba5d34644c7efd14a47fbe4194d8ccb888676537