Malicious PDF — malware analysis report

Static analysis result for SHA-256 358f1c88917278f9…

MALICIOUS

PDF

83.1 KB Created: 2021-03-27 15:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5b3a82cc0b9460019c78d7fc6608d340 SHA-1: 28fadb8fb351efd650c9dcdadbe997d1cf17a024 SHA-256: 358f1c88917278f9c787bb7aad303d679e487f3c06aa1d6f3c63a277c26b93b3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm to direct users to potentially harmful websites. The presence of multiple PDF_SEO_LINK_FARM heuristics further supports this assessment, pointing towards a tactic to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=vizio+m422i-b1+review PDF link annotation
    • http://organicsss.space/lididoseyypyr.pdfIn PDF document text
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/885561b.pdfIn PDF document text
    • http://esmoney.site/3058621915yn74x.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/9a43a97.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/luvoniter_tetawuwevonixi.pdfIn PDF document text
    • http://minuette.me/zulurijatekgazm9.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/jolaxufixegixepew.pdfIn PDF document text
    • https://kebiluxo.weebly.com/uploads/1/3/1/4/131455508/be84ae0b.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/c6d95140338.pdfIn PDF document text
    • http://salopkisa.website/tipalifovazun4vzph.pdfIn PDF document text
    • https://pukunave.weebly.com/uploads/1/3/5/9/135957849/1955363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_339c3848ff83449c8019fed0c3359ca3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/blobfish_eat_information.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/joseph_prince_communion_sermon.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_2f51f73e98c54fc0a5368813b06b60a1.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_4b8e7d344af04f3e8b45b0f1ae96f961.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/comparing_prokaryotic_and_eukaryotic_cells_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/sundara_kandam_tamil_book_read_online.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_e24a194ca2124d3092310cc4d2720af0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 4624 bytes
SHA-256: 7fbeccc7114e1a8f0fced03eb5c8cb9470888fb8a7dc33e7a053dc5516360ec2
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 10748 bytes
SHA-256: bb2a0241fdd6293f903736dcad318ee02470b0d358b071c56820c8c04e864317
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378