Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd49aef9a2420cfb…

MALICIOUS

PDF

72.6 KB Created: 2021-03-24 19:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abc744a345ecc2490d96440b81b7fe62 SHA-1: 27b0c908e2012c177fd97431457b2a77f25407a4 SHA-256: dd49aef9a2420cfb60bb44a6dbd48a61210020e6eeecac3d73ec5b266e69400b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to unknown domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://xezojetit.ru/strik?utm_term=epson+xp-400+ink', are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=epson+xp-400+ink
    • http://tixanijematewe.mypressonline.com/muslim_girl_baby_names_with_meaning.pdf
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/kilifadofe-motatufanibize.pdf
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/1ab0744ccc0.pdf
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/norofek.pdf
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/8ce830acd.pdf
    • http://fojowufuzuno.22web.org/kyushu_electric_power_annual_report.pdf
    • http://winoxolupuvil.getenjoyment.net/zokifemevukinironamob.pdf
    • http://xenejesujotolud.mypressonline.com/electronics_and_communication_engineering_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bbd8716-8110-4be7-ac5f-7617fbeaef42/pabuvupedifi.pdf
    • https://uploads.strikinglycdn.com/files/929ef3cc-2087-40e6-87c8-32a224730c3b/82158748249.pdf
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_72dadcfc195145928fcdbde4dc770be8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6e239b6-4330-4077-a594-1f0f2d0f913d/rulakawumelafe.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_d596ddbf06b847ac8a87730f8c04c304.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3948eb92-f57f-49bd-8602-9b3d86bd1fae/zimofuverofener.pdf
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_aef62c93a77147d08296ad1e276f7e8c.pdf?index=true
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_08f8dc20aaf146918b70fbce055556a5.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_e44e4f7e83e24532b0b919a05ad6670f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/496dc132-51d3-4f35-8135-1070ce637839/fuwakisamexosalubuzeke.pdf
    • https://uploads.strikinglycdn.com/files/6bbfd8a3-05ed-4ec2-ae42-44fc2cfee594/sony_a6500_vs_a6400_for_video.pdf
    • https://uploads.strikinglycdn.com/files/481e8547-04a6-40b7-8925-fbc9a3846879/32961641461.pdf
    • https://uploads.strikinglycdn.com/files/637d2d52-b01f-481d-a16a-ed4b41f20fb2/pevokazojib.pdf
    • http://kagimotazife.epizy.com/60968084366.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deca.bin
1220bd129977b6c5925c2be61fb60f88b513df5d4201fe853ad1f7f8e2f9b350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 4824 bytes
font_01_sfnt_off0000ef67.bin
e9be696a5a9ecebd2061f5529d50d762feeac9095d6e90db2386bdd034fdc379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 11168 bytes

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