Malicious PDF — malware analysis report

Static analysis result for SHA-256 88676f2958dd3a82…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 14:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 148d0a040bb5d6abe6894ba58b949939 SHA-1: bab9ca76ed8e3f1ccb39c36a29b52b8e218e48a4 SHA-256: 88676f2958dd3a8297a5d333514fccaef3ed2a7c07f84e0c8d001713c6989416
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classification point towards a malicious intent to compromise users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=verbs+with+two+objects+exercises+pdf PDF link annotation
    • https://adesso-moosburg.de/images/file/teranobaduma.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/54195610442.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/xuriga.pdfIn PDF document text
    • https://spyboarcams.com/files/vivasivusigu.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/47205703979.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/46374866091.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/begaxakoj.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/pixewetofikotelera.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wipoterevuzomuvevawa.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/mexovomigetejagoxawoviwa.pdfIn PDF document text
    • http://tianfonmm.com/d/files/51741284894.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2ddb02705e445cea05bb932885b7f628/dafekekawavelekevu.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/pusixazasaleravifig.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/91057947164.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pitig.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a4028e4fddcab6d9b775624d3ce3c2b2/95120614931.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/9579002686.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/forezorepuwulotekiborelad.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wafojanizokejegikikexiz.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zirobusanokudonipi.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/77401990331.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/59103188052.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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 10832 bytes
SHA-256: 1c49f0ff923c62de2ed2422f5336baebdfe4129be22f1a41b726c851af0be8f8
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 17380 bytes
SHA-256: 7e33a7e7acba4365940558575904b88ab87f46938c4d413a03dde8af4799d0a4