Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fb1f674711b3eb…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 18:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 687733d4325a5516c2a5deb4cb01d030 SHA-1: a36e69fd0fa4c4893a78f7c0ddbd485a9ca401b0 SHA-256: 38fb1f674711b3eb363e93b9828f78722f82c8daf64de2589a46c06b7eb73465
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords related to 'white pages' and location searches, aligning with the heuristic findings of a link farm. No scripts were extracted, but the PDF structure itself facilitates the redirection to external URLs.

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://golowaki.ru/wix?keyword=white+pages+green+bay+wi PDF link annotation
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/badanidomos_zumuzozelur.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/lilumopeti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_602d87c85946e.pdfIn PDF document text
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/xosipofurukazower.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_602d7d81b6799.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/labiluperefun_zunamex.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/lewepa_jobuke_sinabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6051fb1dad3c7.pdfIn PDF document text
    • http://wozuwekifebar.iblogger.org/21622315980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_60223170e0fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_604d77de60b25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_67b3cc22557d448fba67c03eb51b36cd.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_834977ad8ff14e889597fc5cdc25e6c8.pdf?index=trueIn PDF document text
    • http://filexumif.epizy.com/20269973088.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_1afc112ba93e470893dbe9688d863b6b.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_5fcf4f23e34d47c4b12e359aa0ca3c9a.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_05113e0b306b448caab2442305b6889a.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_5b043eb1a18344038b53bf8960e3c438.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_fe1d729309fc4df7a866c4d9099e8a6f.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_df320206cf61461dbfbbf0f7f319f1d7.pdf?index=trueIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_1f37cad02cc140b7bc2ba373628e6bc7.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_cf97c52f269c4f94a374559c8a8ade98.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_a2205a25d65f4134bbcbdf2ea0a85275.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_8642842f9f5048df89f884d3e0a8a65e.pdf?index=trueIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_c07787b3741a4be2aac123010b029622.pdf?index=trueIn PDF document text
    • http://jojanotesejivi.epizy.com/ullathai_allitha_video_songs_1080p.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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 5396 bytes
SHA-256: dca44e3954f20fa8b217595b041b676ee48629b8e028a87cd7419576b049eedf
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10644 bytes
SHA-256: b3f3e92eab53bb166156bf18284cc08efb1ab4246a84ec0325760d755808a3e5

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