Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd16f7aabf70f5a5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 02:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ef430931dd03c2dcfa4476fa8ab3760 SHA-1: bf3d43f74b60aef8884fcef8d8cec244c75f5d05 SHA-256: fd16f7aabf70f5a57ce450a90d3a0e9633839911df3beb29ff42513c16e349d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://queure.ru/uplcv?utm_term=pawn+shop+master+apk PDF link annotation
    • http://letdentalab.com/img/files/givupulexebebapanupuri.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/rijidisirebe.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_28C1E764CF4C2E84.pdfIn PDF document text
    • https://felicityokolo.com/file/dapazexenepusiriporipam.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/58152261686.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/palepaz.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/tobekurip.pdfIn PDF document text
    • http://ccshecea.org/upload/files/67560193547.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310070979551.pdfIn PDF document text
    • https://baptistfriends.org/media/34037526323.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/nokusojelatabaj.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/45733978570.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/33058699183.pdfIn PDF document text
    • http://livestocktool.com/d/files/velefizuzisupedamogapalat.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/db56549d50ac3a8ebc057c2b06820a32/tupokaboxe.pdfIn PDF document text
    • https://e-midas.ro/files/file/74381948143.pdfIn PDF document text
    • http://wixoon.hu/upload/file/11068645374.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1f665876c---49356809836.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/gimadawanofini.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/zalazedefefukakegip.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_off0000ae56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 17512 bytes
SHA-256: 2fbb2fa76087070db13bdecfac9415c4168fff4a81cb3c0685d869650cb5156c
font_02_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 10556 bytes
SHA-256: 7e731a4c2b397217e087e4a841f93a24c65ef917c7381921352e790edcea6fcb

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