Malicious PDF — malware analysis report

Static analysis result for SHA-256 de971fdeb463ee5c…

MALICIOUS

PDF

86.3 KB Created: 2021-05-21 02:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0fb932acd33c591277e21afeabf80370 SHA-1: d78109d826fd8e373ec5e6800b83a23918637838 SHA-256: de971fdeb463ee5cdd8379b065cd771a8af2ce7f23c0137c78b20d661be924a7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, forming a link farm designed to redirect users to various PDF documents hosted on disposable domains. The document body, though heavily obfuscated, contains references to 'brawl stars free gems generator without human verification', indicating a lure for potentially unwanted or malicious content. The presence of a high ML score and ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=brawl+stars+free+gems+generator+without+human+verification PDF link annotation
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/nugepewovomidivaxije.pdfIn PDF document text
    • https://tujelogujonugi.weebly.com/uploads/1/3/4/4/134491942/bizuwedu-zoxizow.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/venesa.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/nefon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_605b5f5d4388f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_604e1d3c4fd20.pdfIn PDF document text
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/mujifezap-malebuxedowor-nozililiwu-rovugude.pdfIn PDF document text
    • https://pukadove.weebly.com/uploads/1/3/4/6/134694451/3738383.pdfIn PDF document text
    • https://mofivekirupu.weebly.com/uploads/1/3/2/7/132740685/mexawuxafubawo-saboral-vopobalonete.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/2617845.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/motekexe.pdfIn PDF document text
    • https://bikuxemigoveju.weebly.com/uploads/1/3/4/3/134373773/wofelaf_bedizogepoxer_fimadupagino.pdfIn PDF document text
    • https://judelewufajog.weebly.com/uploads/1/3/4/5/134516313/dobubef.pdfIn PDF document text
    • https://bamigabimav.weebly.com/uploads/1/3/1/6/131636977/1729263.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/1315642.pdfIn PDF document text
    • https://godobinoka.weebly.com/uploads/1/3/0/8/130815080/nitakixisaniwojegu.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/kelikawef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d7359d-1897-4feb-9ac9-ce7158568f34/russian_characters_pronunciation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e0d956-997b-4f06-afdb-6e32286fe2d9/81042357069.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/dozofupanufifose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ad0a1d-dbb9-41e3-9653-93fec3c7ae77/jepotemaxepikof.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/gta_cheat_codes_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4b8c01-49f8-4ed7-ab62-acdc9a150241/fighter_gunslinger_5e_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/base_de_dados_definio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 5496 bytes
SHA-256: 5f8807ff4dffa0b9d7c0b10c893ca021f28f7eab3e070d0ab5e45f7e40fcad6e
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10844 bytes
SHA-256: f11ebcfb82e03ea8284d085abc57aa9123950bb403b121477bb6abb31b7986c0
font_02_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 16076 bytes
SHA-256: fce21d86c2b5faa43a5619d6c859002d414ef8720c10ef6ba746f045f1b0bfa7