Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e6c4e451546761…

MALICIOUS

PDF

78.6 KB Created: 2021-04-19 10:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a713cd9c7a6962fff9b830acac47dcb3 SHA-1: 18e187e934a6022175cbcb9b854ace00a55558cd SHA-256: a2e6c4e451546761add7da4a74061147fdf86284f8240e104a2e38bf37396886
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=a+court+of+thorns+and+roses+box+set+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490542/normal_60513d9df106e.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/bihO0ol/guitar_tone_sounds_muffled.pdfIn PDF document text
    • http://mists.space/gunivenomex6k6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fcff3e8c8d45.pdfIn PDF document text
    • http://boledidezole.22web.org/tatoso.pdfIn PDF document text
    • http://my-favshope.online/964925414994ad4t.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/hfihogi/door_catalogue_design.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/jgjgLq3/17714595352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5fdd915ece4e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_600434ba122af.pdfIn PDF document text
    • http://rujamuleta.iblogger.org/mejubinomuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_602d80f624388.pdfIn PDF document text
    • http://rent-nout.site/rijogerijibetnix.pdfIn PDF document text
    • http://sandiego-podcasts.com/casio_illuminator_alarm_chronob88xp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisenapigu.epizy.com/sobazuxekilomaxonepidi.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/60714512571.pdfIn PDF document text
    • http://gesutebixip.epizy.com/dias_feriados_de_marzo_2021.pdfIn PDF document text
    • http://pemukusa.epizy.com/jpmorgan_chase_bank_legal_department_address.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/sql_aptitude_questions_and_answers.pdfIn PDF document text
    • http://jedamonemazuj.epizy.com/71524676159.pdfIn PDF document text
    • http://jifusewu.epizy.com/kasusojoxusafonumesikebu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 5340 bytes
SHA-256: 89707b7a185c66710f6ca5b075a8bc8135076ce97f5616fcb30a24344f164dcb
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 2744 bytes
SHA-256: 99ca08574c0f61703d69c95e98248c5d024aef0632fe13605c1c1e389329cf25
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 10796 bytes
SHA-256: fe65edf161087fe8d513d1defc75b0e96d9e1bea6d6d300d3854779b54e18bb7

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