Malicious PDF — malware analysis report

Static analysis result for SHA-256 1029205bbcd62f2c…

MALICIOUS

PDF

109.1 KB Created: 2021-10-04 12:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8dd24502ea1375f19fd224c1e63febf3 SHA-1: 5553be40e2aea0cbe1cfa7703c18eac442e0bf18 SHA-256: 1029205bbcd62f2c36ec2b96f59f2cf23e2e98cfdb15d52bbabe9b9bbe91552b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or initiate fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=buffy+cook+md PDF link annotation
    • http://canadapremiumlubes.com/survey/userfiles/files/fodewu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/lekaligilog.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/bufozipowogati.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109180053038614.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/nunivamur.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/zoresutopesiku.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/seduvexuxanotolejak.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/nopifirakakumupi.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/53572573937.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/tadobenufopukozo.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/81078190732.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kewowa.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/5917416074.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/witerowemeni.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210929192401_5hy2kz.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/55588591115.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lumukeniwa.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/rufalejisidivudaretotus.pdfIn PDF document text
    • https://foulardfotografando.it/file/88752390797.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/26775799631.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/zilamonudezamab.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/16015148176.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1ab5f1ec---10492413506.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_off00014095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A7 20900 bytes
SHA-256: 0855034e5257adb50de58d7089c57a98af976b4c577b10d2fa1a5f8f18e02c7c
font_02_sfnt_off00019001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19001 10092 bytes
SHA-256: adccfb512b79496a03682ef56532d3f28ea24da2b0b61f01e7b5b4d7ec6be9c9

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