Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4138c9a692c0e6…

MALICIOUS

PDF

72.4 KB Created: 2021-03-20 03:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5e9e1557edf113c7ac27c1ce8e3df68d SHA-1: cd9cd22615e417de58a3766879e92050492b13c6 SHA-256: 3f4138c9a692c0e68129bd1689e019a935a9c1952663f80b67adfa6ac0fad05d
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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://midufefew.ru/wix?keyword=samsung+galaxy+j3+v+user+manual+verizon PDF link annotation
    • https://zifudaxoxatoj.weebly.com/uploads/1/3/5/3/135313713/8fe03ebb.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/5jciiMY/update_carrier_services_android.pdfIn PDF document text
    • https://jovimujokuva.weebly.com/uploads/1/3/2/6/132695493/baxekitez-pazufuriwuloles.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/8707081.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/7710423.pdfIn PDF document text
    • http://wufujapebapu.22web.org/immunization_schedule.pdfIn PDF document text
    • https://virobejiku.weebly.com/uploads/1/3/5/3/135324848/5546585.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/ex9oEid/92387793448.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/77916ca3be2.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/ragal.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuwisarov/ehe1vkQ/1040993712.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/najasamazikuterafusu.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/cgdqhcv/49193667800.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/minaledeku.pdfIn PDF document text
    • http://gifozuxozud.22web.org/cars_2006_hd.pdfIn PDF document text
    • http://puwonasomoso.22web.org/67203248204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanififogijer.epizy.com/word_story_escape_alcatraz_apk.pdfIn PDF document text
    • http://matixonapoler.epizy.com/barrera_hematoencefalica_componentes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e18352c-cb41-4e56-932e-ceb9bf7873f9/9911133108.pdfIn PDF document text
    • http://tinodaxaxaduj.rf.gd/vagamawixabugod.pdfIn PDF document text
    • http://wimifus.rf.gd/skullcandy_push_ultra_earbuds_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a46678-823e-4129-b36e-239ae305ee9a/how_many_chapters_are_in_harry_potter_2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 5628 bytes
SHA-256: 71bb482d9ff5b0922dde4008bbdbd9b749c31aa0b9c2a3e96ac8d8be7dbb2826
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 10420 bytes
SHA-256: 4e1b6848a1ee0cd3072399200fffc49e566846e4452abb92e3a9c94e5a470a5a