Malicious PDF — malware analysis report

Static analysis result for SHA-256 841e572fd2a68cbc…

MALICIOUS

PDF

99.4 KB Created: 2021-03-30 15:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d9b793050af3bc975c61761b4e6edf5 SHA-1: 504f7f9d068ffedb48b5d6399a4ade5d8d4c2956 SHA-256: 841e572fd2a68cbcba47761f0309287ef26d4544c48aadc0a8b8edd71910f83c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://botokaw.ru/award?keyword=reliability+and+survival+analysis+pdf PDF link annotation
    • http://reduslimitaly-ufficiale.site/focusrite_scarlett_18i8_1st_gensioqk.pdfIn PDF document text
    • http://dekupedatibidal.iblogger.org/amoled_burn-_in_fixer_android.pdfIn PDF document text
    • http://vnds-v.website/fovibeofal.pdfIn PDF document text
    • http://fuzirirofo.iblogger.org/format_date_in_crystal_report_8._5.pdfIn PDF document text
    • http://1xbet-regi.site/hanuman_chalisa_lyrics_meaning_in_kannadasl951.pdfIn PDF document text
    • http://tertov.xyz/cat_cj3000_professional_jump_starter_2000a_peak_1000_instant_ampsd0l3f.pdfIn PDF document text
    • https://lipigilukezi.weebly.com/uploads/1/3/5/3/135347924/rapezeb.pdfIn PDF document text
    • http://usacreditscore.info/72153337920sakw7.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/zadewujav_donixunuxibaz_derogow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidojujejotimoj.epizy.com/zodopunenikitukafo.pdfIn PDF document text
    • http://jovukanuwu.rf.gd/wirexavunapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d265dd-a933-417e-bd2b-13ea1a410620/vulogudidazogo.pdfIn PDF document text
    • http://lotawovuvowuk.rf.gd/7582405387.pdfIn PDF document text
    • http://kasupitebuse.rf.gd/vibevizowapoxapabet.pdfIn PDF document text
    • http://gapowap.epizy.com/portrait_of_king_james_1_academy.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/pofasifasarevudegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75292ab5-7a15-4f32-93e7-382fb1768548/tipos_de_bombas_hidraulicas_rotativas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a91250-8caa-4cc3-abd5-db3dafe34534/how_to_start_up_a_central_boiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec553e9-e057-422b-ab0b-c226c76161d5/how_much_do_software_engineers_make_in_dubai.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 5344 bytes
SHA-256: 2babd5979f0b9b94309d9ba250e84441c8d7657d0c442974f57823ed9dc0f6fb
font_01_sfnt_off0001403f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 12332 bytes
SHA-256: d84dc611bec256a7d734ce526aa7dcee3db8c5f2610df5f2e6550e56e8021eef
font_02_sfnt_off00016a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5F 16204 bytes
SHA-256: be330c9649cdf4819fe3726ea8f98c09287689a6c68a5587400573225186116f

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