Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad471cfb2dd35d2…

MALICIOUS

PDF

88.3 KB Created: 2021-03-23 10:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9820828675e23d9c9ae96f0b4fe479f SHA-1: 206097fbc3b0327cc00f9453ab385945a260fe12 SHA-256: dad471cfb2dd35d21dbddee6785baa12234e3ad3a2551b61f5decb86984ef267
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into clicking a link to download a payload.

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 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://leonvi.ru/award?keyword=kiran+bank+po+english+chapterwise+full+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476446/normal_600768f90ce3d.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/thermo_king_reefer_engine_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_603a6bc76968c.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/131319.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/cjajiht/5736009654.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/welijarajo.pdfIn PDF document text
    • https://rediwugozuza.weebly.com/uploads/1/3/1/4/131438197/d54c38a0cc49.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/jjahaeN/crossing_jordan_cast_where_are_they_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410953/normal_60025dd1cacb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_5fd80c648d7d7.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/62715073083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_601820afeafa9.pdfIn PDF document text
    • http://pizetagudagunox.22web.org/cardinal_numbers_exercises_for_adults.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/d213372a-d925-4e08-84b4-c6a12d21d9e0/44807005234.pdfIn PDF document text
    • http://witeguxatuzidaj.epizy.com/piriformis_muscle_pain_when_lying_down.pdfIn PDF document text
    • http://sibijexobesu.epizy.com/what_company_culture_would_you_thrive_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61b1f33-e187-40c1-904b-9d99c0dd002c/36953693082.pdfIn PDF document text
    • http://jefeduwikiw.epizy.com/37929995920.pdfIn PDF document text
    • http://molodetagako.epizy.com/dukinofomav.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 5680 bytes
SHA-256: c25b94fb2b11f1c95657f80807cfefd0c011c947b7095df7db81974efe80e6a2
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 11044 bytes
SHA-256: 16c75163e93de552f626d4c1f7ce0c5f00e967d42e61d334511f93c8237d1432
font_03_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 9996 bytes
SHA-256: fe258d62719b44d21927bf6e593795fb613210605825c39050ed6212f0e7bf0a