Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b671c4fc6410bd9…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 12:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0231cce93d4c83ee76ae8dbed537748b SHA-1: ad24042a6e3cd4781f89a2a3d9a8515bbe3b9646 SHA-256: 5b671c4fc6410bd90b51d21f2be8be4633f2b8196aa9628e215393e09884d430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ppuhperspektywa.pl/files/edytor/file/1310736801.pdf In PDF document text
    • https://motodubai.com/uploaded_images/files/zilonedururiludepofenuden.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/wagowevuwobesusulu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3922eedc7a99f546d1633dd86df62b02/pojujokikawolemotepigi.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mezuxibu.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/kabujotexakujura.pdfIn PDF document text
    • http://th-hl.com///upload/files/lukuwatapugobil.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51427360860.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109211832085110.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14c781b11---65580398668.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/doburorazixop.pdfIn PDF document text
    • http://hbaoge.com/upload/files/sovexalikojoj.pdfIn PDF document text
    • http://tokado.ua/media/file/kidolowemetelovozimosov.pdfIn PDF document text
    • http://sungder.com/upload/fadapolaxemapoje.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/64847878657.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/savivapapovifasatub.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_100542_137.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/88985829434.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/97623400323.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/60334734677.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/tigaxowobevixitovidalegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cost+of+living+in+taiwanPDF 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_off0000b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 16580 bytes
SHA-256: d1f1c70a4e0320ff934ac5b60b092e2a3b4b9d51c7c64d3c51b49bbfa8abb155
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 10340 bytes
SHA-256: 7501ae96a212c81a6664c1abf4b423bf98164bd8fe9684f0597b40409847c6e6

Open this report in the interactive analyzer, or submit your own file for analysis.