Malicious PDF — malware analysis report

Static analysis result for SHA-256 874bfeb6baf3b5a5…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 07:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95755161c9de0ab776018ec88812715f SHA-1: d15580c255f7c32be29e4f36ae86c7d917b1b796 SHA-256: 874bfeb6baf3b5a51009df21525a41a4c28a3e8bda205ede4cf728a1d4a93a51
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=move+data+from+internal+to+sd+card+android PDF link annotation
    • http://gazdalkodjokosan.hu/img/userfiles/file/54490729638.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/44716796723.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/44009119671.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/28411444673.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/pawudavosenesemewezuza.pdfIn PDF document text
    • http://ttc-investco.com/img/files/30539611551.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/81049161202.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/63267887277.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091933391001.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/kuliburizodiwapazuz.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/negegikofokuzugimexebeto.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/binetodij.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mmft3snhdbrivuoidn6vtpf8rv/28209054904.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/94567350002.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/33283355064.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/66808605571.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/66764397962.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/41373030055.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/38585583259.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dc4if43tea01elq8g9jmsur19a/49364693417.pdfIn PDF document text
    • https://edusfera.pl/upload/file/3856520413.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/49323467869.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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 17712 bytes
SHA-256: 5402edfbb1d992620bd185d659fcae2327b657dbb9086e36d6bb26b3c0d99eee
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10696 bytes
SHA-256: e00454d80e60a6d047b7fa4221d68e2914864577fe88680cd2972dbff4e322bc