Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c429c4ada8862db…

MALICIOUS

PDF

77.5 KB Created: 2021-04-28 18:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1e2fcfe4a391e9d9565429fe5ea8139 SHA-1: 12e60b38ee8bcd71312a63ae905781c09acd8a59 SHA-256: 4c429c4ada8862db3a38fbf8356110e497db34d45af6458f668db36287b723a4
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=standard+normal+distribution+z+table+excel PDF link annotation
    • http://allmedbook.com/dozoravosifi75op.pdfIn PDF document text
    • http://domensita.fun/adhd_treatment_guidelines_adultsbrz42.pdfIn PDF document text
    • https://cdn.sqhk.co/nagigureti/3P11hoC/wood_block_puzzle_games_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/XioRgg1/jedowaga.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/91504227906.pdfIn PDF document text
    • http://freedate18.xyz/45119290655xim41.pdfIn PDF document text
    • http://blekrossi.ru/what_is_the_healthiest_meal_at_chick_fil_ajvlzn.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hihb3yT/civ_6_expansion_new_units.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/10077076978.pdfIn PDF document text
    • http://bettermoneytips.com/what_does_sit_a_spell_meanub13t.pdfIn PDF document text
    • http://skidki-day.shop/kekojoviwivuc4rtq.pdfIn PDF document text
    • http://teren.fun/software_update_iphone_5s_ios_13jczzk.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/arifureta_shokugyou_de_sekai_saikyou_novela_ligera_volumen_10.pdfIn PDF document text
    • http://usmileofficial.site/motorola_surfboard_sb6121_password_resetn6evj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotisonuli.epizy.com/hundreds_chart_worksheets_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/37512646907.pdfIn PDF document text
    • http://xelidamos.epizy.com/15381167202.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/suvorofef.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/6515140431.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/40765662173.pdfIn PDF document text
    • http://sobikunukozi.rf.gd/edgar_allan_poe_the_raven.pdfIn PDF document text
    • http://mapelapelebiben.rf.gd/15766948991.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/22570990935.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 5448 bytes
SHA-256: d0a6e3de62b99f0c45b7d0385f65568d1ecb1f93f9e85e8ad2e572bbbe43e461
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 10424 bytes
SHA-256: 521bde1fb1788e0a47def236b9e55f04c56e61a01bb4f7ab060e5797a54dfaf6

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