Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca53c32ee84e466d…

MALICIOUS

PDF

78.6 KB Created: 2021-03-16 00:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8cc143d4c681c1bc6ef46f895a86bee9 SHA-1: b1817a716b8cb7f20465ef7c3631a8762a1d1ce8 SHA-256: ca53c32ee84e466d96aab026951be16d7b27667e8007f31d52905584635c55a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly suggests malicious intent, and the presence of multiple external URIs supports the conclusion that the document is designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=stand+by+me+lyrics+oasis+artinya PDF link annotation
    • https://cdn.sqhk.co/luwokiseg/agfoA2R/3359142536.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/6c87b0a.pdfIn PDF document text
    • http://expo-kit.ru/kingfisher_house_newmarket_cqc_report4it07.pdfIn PDF document text
    • https://mebopezik.weebly.com/uploads/1/3/4/7/134772208/d9013614887f0.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/ichiThb/america_east_men_s_basketball_tournament_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_5fd34d7de5815.pdfIn PDF document text
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/88693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419828/normal_5feb607b1f79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_6031d80c6abfc.pdfIn PDF document text
    • http://autoport76.online/satedoturunesukowabone1si.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_60464ca78281e.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/zinelijux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_4a32cd7c5fa849e083c60f93ae38c3fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/260bd0ce-de1e-48d4-abd0-e0f02f0671e7/wipapudike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb597b6-820e-416e-9cb1-abeffd095273/young_sherlock_holmes_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb31f8bd-9c7b-494f-af8e-c5553cbf0ded/why_does_my_troy_bilt_lawn_mower_wont_start.pdfIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_53b1fb278fb14eeba0f218a18d7ef6e4.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_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5428 bytes
SHA-256: ab19e83205e99521b9cc497fbff84e697b59f378eb3acca2c89a3e4dead01eef
font_01_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 10804 bytes
SHA-256: 875bf67ccecb77d87f5fb7ed58ff9f2a58b833c7d56982b3a9076b26657c8951

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