Malicious PDF — malware analysis report

Static analysis result for SHA-256 992b39b27f5fd487…

MALICIOUS

PDF

67.8 KB Created: 2021-03-09 19:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b5e77d530cf0cf297c0238516bfa8c4 SHA-1: f77fe4d88fbfab1b7a58368e267cb0534dba142d SHA-256: 992b39b27f5fd487d96ecbd9172405602ace566b84b278f80324d94c9b26cf88
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=handy+stitcher+awl PDF link annotation
    • https://cdn.sqhk.co/fenazijeguk/dhhkFij/flank_that_tank.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/ZijjdcG/ropejikidu.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/6fb5c50cf.pdfIn PDF document text
    • http://nudistoff.club/como_ser_un_buen_lider_cristiano_segun_la_bibliaq6si4.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/dowalatorasarexa9m4ni.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/senuj.pdfIn PDF document text
    • http://onlinetyz.xyz/how_to_understand_your_ekgmji4z.pdfIn PDF document text
    • http://vknart.xyz/avast_antivirus_with_crack_2017dylxj.pdfIn PDF document text
    • http://myshoes.moscow/nufokerewib50ti.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/ecd0987a-1a8f-47a4-a124-b7c46602cf90/gary_nelson_pediatric_sports_therapy.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_78510bc7978746deac03566edd377d3e.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_7edfe8641f6c4790bd8423ec3d8ab072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdb2fc8-175d-4a5e-8015-45b786af18b7/how_to_set_update_time_on_dish_hopper.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_4cbe45cde7de4c2f82bb386c0af3f490.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc17b372-cf5e-4498-9766-2c6057bc1e51/what_is_the_magic_mountain_about.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_ca44ba9a9cd14d8583a80b42e1413ec8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6967a79c-1873-4369-8b86-d9d271462096/luvazalaxasiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cfb909-1aec-4164-b0d6-5996570b9125/technicolor_tc7200_hard_reset.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

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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 5180 bytes
SHA-256: f635a706af65b2b7e7da6cfbe81ead5e4218995f8935b539e4f7e109760ad033
font_01_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 11708 bytes
SHA-256: 84fa440d3287a0a276096024192f1ecf766574d032c93dc5999b12afb7cd5e94

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