Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb819455eb48574c…

MALICIOUS

PDF

76.5 KB Created: 2021-01-19 06:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b16b197104e1590004223b4e68220c9d SHA-1: 479ac404205c34225d65ad92f554f84f847cc448 SHA-256: fb819455eb48574c72abebdb331b91028e5c79eb0e4fd04713e36d5ba185d35d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The primary URL, 'https://trafftec.ru/wb?keyword=brave%20dungeon%20immortal%20legend%20redeem%20codes', suggests a lure related to game redeem codes. The document body is heavily obfuscated and contains no readable text, but the presence of numerous external links points to an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/wb?keyword=brave%20dungeon%20immortal%20legend%20redeem%20codes PDF link annotation
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/6deebbc.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/gdohgja/dewobisulurapuluxisipa.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/pinexipozovumidavi.pdfIn PDF document text
    • https://kefobisow.weebly.com/uploads/1/3/4/7/134733217/dalidateraxapajuv.pdfIn PDF document text
    • https://site-1178025.mozfiles.com/files/1178025/62516473057.pdfIn PDF document text
    • https://site-1216916.mozfiles.com/files/1216916/google_analytics_certification_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/ijjhrva/17084560115.pdfIn PDF document text
    • https://site-1176337.mozfiles.com/files/1176337/worikowulurajef.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/ji8jcjc/play_tube_download_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/c5kibgi/zowiserexetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xoponupesede.epizy.com/garopijukoxabubimuzo.pdfIn PDF document text
    • http://xejarejunap.rf.gd/22687955013.pdfIn PDF document text
    • http://losaxoxajav.epizy.com/anatomy_and_physiology_chapter_18_study_guide.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 5252 bytes
SHA-256: 4a8c9f887e72ff0404e34641221cbaad481d2bd8d4633a981de19e8333b0ba73
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 10492 bytes
SHA-256: e5ce88367af52daaf53565569b0ab7771389e88336055b82dc99cbb1e263c55d
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16096 bytes
SHA-256: 11c876540e83260e343ab508037f3d9dce964157b771c38a462df6f1c9c24668
font_03_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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