Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac903a03284fb2b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-13 23:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeeab91b5ce7956ab9583c5d09618e32 SHA-1: 1d50f0507f0b8a909fd865a6eaad83cccb635966 SHA-256: 9ac903a03284fb2b5daf1e0907162a5b35eb387608a8ff64d2a5d053afaf7611
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs and the document's structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://xajibur.ru/wix?keyword=fruta+planta+chinese+diet+pills
    • https://cdn.sqhk.co/rozamulev/n31PijY/26573288262.pdf
    • http://mumopajikex.mygamesonline.org/86378227721.pdf
    • http://helplnstagramoffice.com/analytical_chemistry_mcqs3e86y.pdf
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/nazereruj_tuxiji_neduronibo_bapolurazofetiw.pdf
    • https://baponejivo.weebly.com/uploads/1/3/5/9/135986917/nizafunutux.pdf
    • http://toluvubub.mygamesonline.org/analgsicos_opioides.pdf
    • http://solent.bar/rcc_barrios_moniciones_ciclo_cqr6n6.pdf
    • https://cdn.sqhk.co/wijenipa/wgcEhcC/jolly_phonics_alphabet_song.pdf
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/naravug.pdf
    • http://lazategomid.scienceontheweb.net/tree_of_life_meaning_lds.pdf
    • https://cdn.sqhk.co/lazaxosu/vUZpsig/tosisiduperota.pdf
    • http://pejazadajenatew.getenjoyment.net/how_would_you_conduct_an_investigation_of_a_linux_system.pdf
    • https://cdn.sqhk.co/nogawevorus/kGijtfP/79054255199.pdf
    • http://ronifibofizet.medianewsonline.com/92743108520.pdf
    • https://gevupowola.weebly.com/uploads/1/3/1/4/131483584/medatunogi.pdf
    • http://chambrehq.xyz/sikazinejamafivowatadotoxs3b2i.pdf
    • http://tumuduwaju.mypressonline.com/princeton_review_sat_math_2_practice_test.pdf
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/5012658.pdf
    • http://keepqifi.site/corporate_social_responsibility_in_pakistani_companies_canadaeklxc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_421eb0c11b33428d86d645b9d2820d09.pdf?index=true
    • http://rojanesifilagu.myartsonline.com/juwizojo.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_d2b9ffc9017142fa8e6d1643d0cd3db0.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_547d2c8eb46b464d92652e13afd7719f.pdf?index=true
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_1836b94b1b6e42cda2120ef445654383.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f055.bin
1a3d3e0294ab0356a6852ac6140c33429653d80a22f4daf853b533d95b947790		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5116 bytes
font_01_sfnt_off000101b2.bin
7f8d88a3979723ed0d2e3947446487fab472e32574dd81165aa2ab149594bbe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 11528 bytes

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