Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49fc64f64e70349…

MALICIOUS

PDF

68.4 KB Created: 2021-03-16 04:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7c43558462ec1c88711e25101c6241d2 SHA-1: 0a391a513d1d9f36ac48f2c5af5625dfc6cbf1c9 SHA-256: e49fc64f64e7034905fa131c5615e20bc8a0fe0ef60ace6ee62b50c8428af292
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, indicating a redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://resalured.ru/123?utm_term=imb+reports+2017 PDF link annotation
    • http://bigwin-1xbet.fun/master_system_emu_apk97iy4.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/what_are_the_naeyc_standards.pdfIn PDF document text
    • http://phulop.store/how_to_see_normal_distribution_tablepc5tt.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/tugemadabobudetigoxinube.pdfIn PDF document text
    • http://rowefuzoj.mygamesonline.org/rulunaxezejozape.pdfIn PDF document text
    • http://letxxnx.org/maths_book_class_6b7atc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd0c9df-c3a3-47cf-a9a2-30af446467d0/survival_of_the_fittest_meaning_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc2bd9c-5e90-4057-a77f-b50b6b892876/kegavawuvatebigamob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bcebe4-53f3-42d1-96fc-f5bf126f8442/riwaw.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_4443d2a6a3da46c0aeb3e44fcf2de88d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3be3485-2203-444d-b5b5-9adc0e141b39/sharp_carousel_convection_microwave_user_manual.pdfIn PDF document text
    • http://jorasixu.myartsonline.com/bhagavad_gita_meaning_in_tamil.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_5e5ecff458944da1b094f01ba60cf8cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8b82b0-773d-4be5-ba9c-cc0333b0d65a/totoxikitanovimegewasolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b3fcba-d989-443d-ad73-96180b8e1128/kekutuj.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_23966a1470e342dc9bb0d3fc7c716484.pdf?index=trueIn PDF document text
    • http://gigufapaw.epizy.com/great_ampong_me_yare_nti.pdfIn PDF document text
    • http://loluxemo.epizy.com/61784169086.pdfIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_d14bdff242dc4f9893b1360e3780b0ad.pdf?index=trueIn PDF document text
    • http://nuliduwaxud.rf.gd/gluten_free_and_dairy_free_desserts_for_thanksgiving.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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 5204 bytes
SHA-256: ea1cdaa91923e107738326655bb019451a599772436a53c60a796a17f9447838
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 10176 bytes
SHA-256: ac68eccfe172588b0faf470348c26b00f01d88766679da478a4103154dca6fe3

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