Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfbb5fc699c65bc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 06:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dfe1d94e3f8e816e2a359bb745a4708 SHA-1: 6a20ab3a88a04232a3433fcc7e5ac4c7bec67764 SHA-256: acfbb5fc699c65bc545aa02fe28053ea31aeefd383a3278b3aee085c9f36db77
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the distribution of further malware. The document's structure and numerous external links suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=traffic+google+maps+android PDF link annotation
    • http://fleshlight-tw.com/userfiles/file/fosuvixanedi.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/xexuvapekolorefus.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bamimuwo.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/14361885509.pdfIn PDF document text
    • http://www.og2c.com/images/file/maxosejox.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/nuripudulelat.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/jetepovi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/pinemipekizoxan.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/57d88095a33677e93e805438654b24e5/77576806797.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zawobed.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/75332010397.pdfIn PDF document text
    • http://panova-art.com/files/file/rusemunotatoxug.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/6529025340.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/nunokiragezo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a81585794---58222369130.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/duwutosegazademozaboke.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/muwalofarazixelofivirepig.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/zowuk.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/91561434679.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/natifoka.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/28975536030.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/43751391081.pdfIn PDF document text
    • http://citranco.com/users/files/69582860641.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/fudowud.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/83297562417.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/votuzewiw.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_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 10828 bytes
SHA-256: 6d1573331d96130576cd6ce151d1d5fa64e7471567158e1be9556ceb70ebc305
font_01_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16908 bytes
SHA-256: 8e118db64be6b7d568f90e1b4769933096d9105cf6ec7ee7f68dde5e13261c76
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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