Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bcb6ee214468b8…

MALICIOUS

PDF

91.4 KB Created: 2021-03-23 14:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cde8ca0f1de0567090549de3b093d474 SHA-1: 05b62c04199144966fef1f3c52d360153cf2d3b5 SHA-256: f3bcb6ee214468b88978a571cf78b96a1c3708268f557c4bd753ffb3b9f34c83
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely a spearphishing attachment, aiming to redirect users to potentially harmful websites.

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://ponafet.ru/wix?keyword=shining+nikki+guide PDF link annotation
    • http://gvidilon.ru/descargar_popurri_de_antony_santo_en_vivovd87c.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/a4dae0af052b82.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/gilelufarenejokitorureen08v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_6028a89447166.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/LsWIhf6/among_us_character_maker_picrew.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jiha7DF/saginunumaxezaje.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/NTiajZS/doesn_t_mean_anything_piano_sheet_music.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/lagazu.pdfIn PDF document text
    • https://cdn.sqhk.co/zowuvutevak/giH8tGp/gowuxulunuvafaluka.pdfIn PDF document text
    • https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/ximixoneweko.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/bereligegedawux-fotetizorok-mudafute-detudiladep.pdfIn PDF document text
    • https://cdn.sqhk.co/vexavudakepa/dlVGzhg/business_administration_accounting_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/eRijFjf/tibexozoged.pdfIn PDF document text
    • https://cdn.sqhk.co/dupabeket/8idbohg/15950527039.pdfIn PDF document text
    • http://lumacy.site/pestle_analysis_of_applecarxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_60374b2164004.pdfIn PDF document text
    • http://idealica-ituficiale.website/h22_balance_shaft_delete_diycmqbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keviful.epizy.com/at_lp120xusb_preamp.pdfIn PDF document text
    • http://gapajafikotu.rf.gd/how_to_loosen_the_straps_on_graco_snugride.pdfIn PDF document text
    • http://lometazojubusi.rf.gd/56032239721.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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 12064 bytes
SHA-256: 0d92e8590b35a5ec3a2641ed4136ffd53063131944275915a9a3e96cb8a03c2e
font_01_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 4740 bytes
SHA-256: 95650db49d151c2f2d109a61caee6e48cd698d91ce444e06a10ec6b2b5dafe39
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 11820 bytes
SHA-256: 74b182e367e03871233ea3a2f24739044be5013c023de511598475d349155a92
font_03_sfnt_off00014ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE0 16092 bytes
SHA-256: 5f88abde4bb3a275ee7bf7e72e6cc61215b24756dc622ff5cdbc0e2c86e7fe4a