Malicious PDF — malware analysis report

Static analysis result for SHA-256 c481f7fe78310791…

MALICIOUS

PDF

76.3 KB Created: 2021-04-17 01:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ab076e1069f2ecc1972fa3b8da3f45b SHA-1: d8385ad4fa2bd06bd965cefdc40db0817f028955 SHA-256: c481f7fe783107916670b497e83743ae5424f38d0dd33c9cde291f9291733da8
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 0.9999

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://maypoin.ru/strik?utm_term=past+simple+vs+past+continuous+exercises+for+beginners+pdf+intermediate PDF link annotation
    • http://drive4mclanemilwaukee.com/the_joy_of_creation_reborn6abwp.pdfIn PDF document text
    • http://goodsfor.life/sedafilalrad8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_6068743490d67.pdfIn PDF document text
    • http://pr-bux.online/gosizerobivuvkw23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_5feebea1eb7b4.pdfIn PDF document text
    • http://tizezs.xyz/anywhere_for_you_song_freeudwzk.pdfIn PDF document text
    • http://ozalupa.space/pathfinder_bestiary_2_download_freex55ah.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/45071155025aphrx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_6035a26ccb811.pdfIn PDF document text
    • http://dwatches.site/30736070065gct4y.pdfIn PDF document text
    • http://noverst.xyz/jlab_air_true_wireless_earbuds_manualopoup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_6094b7c143c04443b9af11a4f1a7a847.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_3ed720e737dc42cbb9abac66a3ea38a4.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_63ededd7104d4ccbb7ab023c1c9956dc.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_604d40f2a3ae4477b21519fc28ad4e2e.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_4c47df1552be406099ed60813b764606.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_bcca525d000e4d728423993f40a92060.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_1ccf4c4e13d74993bc26dac16e528442.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5744 bytes
SHA-256: 78487854716dcf6c5dfd5d9fc489ecf3318bc0eb9413a6b2fc4a1c040084aa6f
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10312 bytes
SHA-256: 6d9c7bc44676135a9264f284fbb3e43f456aa4635383ce331e9f3be7aa7f8100

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