Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16ea7a6840071bb…

MALICIOUS

PDF

83.5 KB Created: 2021-03-25 05:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cf333182d37b051e54f887b8bbb14857 SHA-1: 9e40c247d43f2a612eeb5764886ca8e71e414ddb SHA-256: a16ea7a6840071bbf9df48bc98ac8b39ada4bef5bb2ccec13bda401dafd813d5
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 0.9991

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://zajinet.ru/wix?keyword=lord+of+the+flies+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6041cd9403098.pdfIn PDF document text
    • https://xunijududivajol.weebly.com/uploads/1/3/0/9/130969830/kedilov-kujav-rapiri-fesesotutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_604cd0d5d5c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457332/normal_5fcabacc527b4.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/figgfji/reloluxukan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_602c8e26dcda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_6021ffac79d97.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/RJRhjfM/soledomavetesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_601395274f925.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/a790e09.pdfIn PDF document text
    • https://cdn.sqhk.co/kisetofekuzi/jSqAiJt/cartoon_wars_3_gunner_units.pdfIn PDF document text
    • https://rutesobob.weebly.com/uploads/1/3/1/8/131856950/ziwezab_sumuvaju_wuvagekare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6025abd0f0d50.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/gjj3hcx/moleleti.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/2868063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_6019b101bc622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5feb4a0a40ab1.pdfIn PDF document text
    • https://mujoganik.weebly.com/uploads/1/3/0/7/130776873/5059725.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/a8e24241-b744-4c09-a541-cc44e30a8818/fixiparut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ef7f74-7df6-4a51-afff-42f84e182383/sopev.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_21e771a065304927b9b7a15fb8e6fb83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdce976-002b-4def-b72c-b88c1869cd4f/plantronics_voyager_5200_pairing_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f83d75b-8a79-471d-97c8-55f5a04e8a30/delirium_book_full_movie.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_f52b141448e1455bae686b48e854b3f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a80e07-9ec1-4261-808e-32951b4a653b/qu_es_el_sistema_tegumentario.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_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 4852 bytes
SHA-256: ef29d6d1ef9e0548a2dabeccab39b5fc5d9cc1d7b278c12b7b1b3d7d09b027e0
font_01_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 10280 bytes
SHA-256: 5e0a140883fe9ad5ee8d41db61c1a7e87e3b277f4bac0c8861e89f1cc16aefc8

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