Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e7eabe6078583e…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 04:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 198acdd1147a82adac425d940f0bdc17 SHA-1: b3ae638d0ad766a3a795de75135dacca0710d5fc SHA-256: 58e7eabe6078583ee5cf000f2b35ac05098b4a0fa8390c000318fdbdf13cb564
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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.
  • 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://bologen.ru/123?utm_term=calendar+invite+meeting+template PDF link annotation
    • http://freud.icu/cant_connect_roku_to_wifi_no_remotenz6dv.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/zajevefebofu.pdfIn PDF document text
    • http://e-devletodeme.net/jozevjz34s.pdfIn PDF document text
    • http://amsidgi.xyz/mekunewuzavexiwolujizw3.pdfIn PDF document text
    • http://swiss-gear.shop/97641136369cstv8.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/mijubobadezig_tegamijiwuva_regedi_gelov.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/g6qieMH/subway_ninja_run_game_online.pdfIn PDF document text
    • https://xobawaxotax.weebly.com/uploads/1/3/1/4/131453143/kijaxatojuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6046e13f9b751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_603aff5c9cccb.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/jhhidhb/dora_and_friends_into_the_city_episodes.pdfIn PDF document text
    • http://krokoboko6.xyz/22335998224xegzh.pdfIn PDF document text
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/nabog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_7f0d0bcbb5864cd98a3c97f6b3bfe137.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b347376-2770-4c3d-9668-40edd57d8475/pre_marital_counselling_questionnaire.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_a221c7e3f23d49b6bb0206ffff8f8774.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_fda8d626643148f49bfe4f593e1950b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c37d589-b18c-4bbc-877d-f5ea1f722c90/how_to_test_craftsman_19.2_volt_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28707a12-b418-4e55-a375-2ecc87f0cfb3/bill_of_exchange_sample.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_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 5064 bytes
SHA-256: 0979c1030c30e835d55d5a5d2b1ee8a71dafe8d9f6e75fecefcf88405dc935d5
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10780 bytes
SHA-256: 7995f027e8a91eddeb7888e9e7473be62c56f1eecb8e521f98ed78ac1c278408

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