Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf923391b26d4212…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 12:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 600abfcd82425ce7992077455602405a SHA-1: b262edeacf97b446a00cdc2e952f90cf895eaa79 SHA-256: cf923391b26d42122144b5daa708f2acbc3695af3a4c665ec6f40a8dad6c5244
166 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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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=volvo+s60+t4+2020+review PDF link annotation
    • http://aycotoro6.xyz/the_crown_cast_change_comparisonozvry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_601b725ac0f15.pdfIn PDF document text
    • http://hookup666.site/duvurufaxubdt2k.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/40566234444gdssu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fff76c61b21f.pdfIn PDF document text
    • http://healthytrands.com/vidutitidk6uwu.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/Yphjie5/sifeta.pdfIn PDF document text
    • http://vikidavilor.22web.org/adobe_illustrator_cs3_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/dphjCii/kibuzuzusavopivosubidiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6022aea20b7ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5feb0d1fdd066.pdfIn PDF document text
    • http://endi-itali.space/booth_algorithm0hf6n.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/f78039b5-62b5-476a-a5c4-434222177227/bumepujurofodivijomukow.pdfIn PDF document text
    • http://gatafowe.epizy.com/gorefiwewovepuzun.pdfIn PDF document text
    • http://wowekujefabog.epizy.com/peter_shaffer_amadeus.pdfIn PDF document text
    • http://melakevejemi.epizy.com/10_avatars_of_vishnu_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f490208-aa8c-4468-824d-029a8fd85aaf/graco_pack_and_play_instruction_manual.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/morixubizukirozaworidojog.pdfIn PDF document text
    • http://digifasofow.rf.gd/reduce_file_size_quartz_filter.pdfIn PDF document text
    • http://venugowus.epizy.com/56779444122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a7c2e8-a809-4609-9699-b18f67cfbfd8/what_is_the_difference_between_a_meta_analysis_and_a_meta_synthesis_systematic_review.pdfIn PDF document text
    • http://taluxukuvasule.epizy.com/optex_bx80nr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a69875-d97d-4515-aa06-8eccd2f83da8/42439933890.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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5100 bytes
SHA-256: 3f9ee1432220dfe4b66b4ce63faf5c1ac35b2d5e0a8a2998e7058606a67a0a7d
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 11220 bytes
SHA-256: f2a47ec931b691c0bf7c8f8493bea61b557db4ba8eb543857fd95895f5ac226c

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