Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4572d135cd38fe…

MALICIOUS

PDF

75.8 KB Created: 2021-03-21 20:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e2ed8f493c4ed8ff0ae1b775a95eb0a SHA-1: 932a4170f60437b1357d993c6b73f734df1f2a38 SHA-256: 4b4572d135cd38fec032b9aeb148e6133e8a63df60750647d7ff8659b5355fad
186 Risk Score

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 0.9960

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://xajibur.ru/123?utm_term=banquet+event+order+forms PDF link annotation
    • https://cdn.sqhk.co/xovujiroveg/cfmhuyV/mad_dex_pc_online.pdfIn PDF document text
    • http://extrameets.fun/red_rising_4th_book1n77z.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/MhfCgdf/jazz_super_weekly_max_internet_package.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_600c62ee2cce2.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/how_much_does_an_ethical_hacker_earn_uktmcxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_5fd7888349493.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/7iaihyX/patul.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/ezAuM1n/tixilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/eDhdCii/41872821784.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/dibJjdw/history_of_christianity_in_nigeria_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fccb6ef72312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60120a370b21f.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/ghjghag/sumugelajolotusasoxafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451549/normal_5fe1a09c80aea.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/2GgUqhw/bounce_balloons_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/bollywood_movies_trailer_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/xixeromalufasajalibe.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_4c89f2258ce24351bd46be83fa07ceb0.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_4e87c3c64dea4f6b886e432e5526f164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/53493106264.pdfIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_874700e7f7134a3096cb9157522795de.pdf?index=trueIn PDF document text
    • https://ab38f0b8-b274-4020-91f3-e6554b072184.filesusr.com/ugd/9c43ec_1fec2ffbef3448bebda9c79b6e5166ec.pdf?index=trueIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_2ff0803811fe47a484557a32d0d4c616.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/debate_about_school_uniforms_should_be_abolished.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/51751352652.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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 5256 bytes
SHA-256: 7b1d2f5b8add431e3b3d6b22742907a8e857c217d3335c96f47f13ed531be4cd
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 10624 bytes
SHA-256: e0ff1d2ac948491dc192d8f1550c9b9b7984406c2852a651ea70d02ac59ea472