Malicious PDF — malware analysis report

Static analysis result for SHA-256 6443e40d47d7afb5…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 20:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a8889607f56f29e3a031db272a83dfd5 SHA-1: 52c474c7fc0fcf0291e5471addbeb5191a7cf089 SHA-256: 6443e40d47d7afb5f160558440d36c7f316829f8f3b49570fa6d8f3ad1df0c4b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=macbeth+act+2+scene+2+and+3+summary PDF link annotation
    • https://cdn.sqhk.co/ferudati/hfeiivB/70863131993.pdfIn PDF document text
    • http://moderivapotilos.22web.org/construct_2_personal_license_crack.pdfIn PDF document text
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/sivimen_bawerel_dodoleronolaraz_silexalawezufi.pdfIn PDF document text
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/mokageditojudesox.pdfIn PDF document text
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/7076738.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/gijaKji/dikaxasivipu.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/19983814081.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/xabumanis.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/48159091961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/what_types_of_intermolecular_forces_are_present_in_ammonia.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/22976427574.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/59844696866.pdfIn PDF document text
    • http://xiwinuxad.rf.gd/why_does_my_washer_not_fill_with_cold_water.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/55941023706.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/dieta_gastroenteritis_fisterra.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/thiruvilaiyaadal_aarambam_movie_songs_free_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/bizapesidu.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/69614412636.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/44383465922.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_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 5688 bytes
SHA-256: b66ddceec1d4158fb732383529f45e7c6019e8ff898316ac2551907ae72eecaf
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 10220 bytes
SHA-256: 0317df1f684f103bd58685c4eddeaa3407915a3a9d349dabdd9f62ea2ac91661

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