Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e5a816c5863634…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 11:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d98170a07c0cc230f0f1b3305e7fac2 SHA-1: 3b5a02b6e8966db1e00b01bdc4a8a99c22a110c5 SHA-256: e3e5a816c5863634ea0599f3a7133087d2cce6c47e0f79ca7c093200a3947438
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number for a fabricated issue. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tlkingatlan.hu/kepek/other/file/13768483304.pdf In PDF document text
    • http://giovanniseneca.eu/userfiles/files/72326916745.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/zurekojozosamevaro.pdfIn PDF document text
    • https://olterus.info/contents/files/sibevovikexefode.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/27929208037.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/82182112066.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/monejeburisotamexukolobo.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/22509226716.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/96770037582.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/86386734752.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/govekexo.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/bokutajefuteter.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b4f956acb75a3cbf1f86d1e8697d792c/jatalixepa.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/wawizetite.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/rupodotetevekirajuzedamu.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/fekuniwol.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70e43e3cb---23131017396.pdfIn PDF document text
    • http://krupongs.com/images/file/sejagubep.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/gerezezibobukugudanaj.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xofob.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/vepisosiruboxijofitimi.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/bajopomawip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+v+story+mode+cheats+pcPDF 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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 10756 bytes
SHA-256: 6b450ca7f1391011b3bfae82ab5e36be7052dbccac8b94d524b6cc2c71b8e3f3
font_02_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 17728 bytes
SHA-256: ccb6040a7f237d7b0b23942cd483839ad736bdcb76f49373a3e37140a585e445