Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c292da941da3b0…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 13:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 40b5896989fe8fc9767f766956198d5a SHA-1: 31b027ed9d870ec5f25d01ccdf5d48f0891ada9a SHA-256: 35c292da941da3b04d1a046844ab88d53f501ece0a537900620b5615fde061a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=forager+puzzles+fire+galaxy PDF link annotation
    • http://anpo.vn/upload/files/fopimujawibexepewopefaj.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/lelipabipijopivoluk.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/58458264025.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/41458552844.pdfIn PDF document text
    • https://chptravel.ir/data/file/moken.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/lepiwewor.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/velezibijux.pdfIn PDF document text
    • http://gr-chem.com/upload/files/94868420295.pdfIn PDF document text
    • https://ka-base.no/images_students/files/fonidumo.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/sonemomazur.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/kivik.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nedogo.pdfIn PDF document text
    • http://dptech.vn/uploads/files/35966178758.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/b5mkjm9v4g7v5562p6r2fmha63/xeroratuladulokoxi.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bisibidaral.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/55157891126.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sixokuju.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/97252924467.pdfIn PDF document text
    • https://petikdaun.com/contents/files/71320283487.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/70576987028.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/fofisasaxopifeniva.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/96347573637.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/68718145495.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/75496820516.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/78401848761.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://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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 10684 bytes
SHA-256: abf5d6014258555bcad1d2f4ec3244a8d810d3bc62a751bc236a04de6fb0a396
font_01_sfnt_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16960 bytes
SHA-256: ad1a5ee83a0960737c8e0b5f4b52f6edb7c6573e63425d75e2413ed70e9fc497