Malicious PDF — malware analysis report

Static analysis result for SHA-256 e891bf3f26f98ec5…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 21:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee3e123226a3f16bbc2c958db8c3d869 SHA-1: f135c3b5c5da48b8c6b77a4cfac550a2f5d3a201 SHA-256: e891bf3f26f98ec56c5fa7e968ba6121bc51db20a9d85a99fd01101514539c41
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a callback phishing lure. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest it's designed to trick users into contacting malicious actors under the guise of support or account issues. The presence of numerous unknown URLs indicates a potential for further malicious activity or redirection.

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://homestayhoian.vn/uploads/image/files/saboduwanulogoxemex.pdf In PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xakojedukagesojagelajaz.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovesegubokibazapagawizu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lojogefigesizimop.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jikuza.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137743e42c11---xapopitigimofajer.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/tazexumurupilixupopibaju.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vegesizararuvorabefatab.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/gasefelotor.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/mitevoburopelopevoranoro.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/bomukidoxukuwikurex.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/7355537746.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/motitoluwalifov.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/27579499658.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/wegex.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109030308054663.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb69af4cd66c2579c6bf2d55a9a285e2/xisuzepazurujo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lafazovizitaxiwavadix.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/51500416925.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/1906437743.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/30948935122.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gadudalugubezej.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/96216731293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=elavon+ingenico+ict250+manualPDF 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_off0000bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 10832 bytes
SHA-256: d069346bde3c311f7863d5d4249c903c51c99cfdf5ffc2fafd63dab659996cbd
font_01_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 17572 bytes
SHA-256: 76e8b30ba98bdcd645e281aeba2fce04f985e0ee2d0e5f11a2bd77c86c380a30
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1