Malicious PDF — malware analysis report

Static analysis result for SHA-256 57327eefde9b66e9…

MALICIOUS

PDF

73.8 KB Created: 2021-04-21 13:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6db29237a8ab17f071c4850f88fa2b98 SHA-1: c6631e2d4accd313fb0c9b2b18602cb2651f7a21 SHA-256: 57327eefde9b66e969b89bddecc33e9898a3d7c8a69d9e87f431a0ca187d04e6
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 0.9998

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://leonvi.ru/strik?utm_term=vicks+vaporizer+baby+safe PDF link annotation
    • http://brumbum2.xyz/115516998963xe9v.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/best_german_grammar_book_for_beginnersllrvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_602b61b93e4d0.pdfIn PDF document text
    • http://goldstein.berlin/primer_escudo_de_costa_ricar051c.pdfIn PDF document text
    • https://wixalotoduf.weebly.com/uploads/1/3/5/3/135305273/difipe.pdfIn PDF document text
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/jixomu_vubivibepojipem_lixopibunavomi_fakinixezugena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fd09e41693a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376125/normal_5fedc68d2efa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_6017972767f94.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/the_killing_joke_did_batman_kill_joker_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd64fade82b3.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/metro_map_montreal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_9af08a1eda6d469b8d8999a5eae8bbd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7288a344-35aa-472f-bbe7-e1ea6456b958/55445028420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c3490d-062f-4e1c-8103-705a71676e9c/how_to_freeze_and_unfreeze_bread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd46ced4-df73-47fa-a56b-0662328228b3/is_big_little_lies_available_on_amazon_prime.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_c778555da7464b169550bbfd005f7446.pdf?index=trueIn 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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 5356 bytes
SHA-256: e54503dc097cff94f46ae2942fa8680137acd24506023de27c77474314f10f97
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10420 bytes
SHA-256: a10418344fb57d44eebc1310397f2216d4faf7fdeb34f4daccbb8aadc4fc7553

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