Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a599a38dd70fd3e…

MALICIOUS

PDF

131.0 KB Created: 2021-04-05 01:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0218627679231be8eb8cdb16d0888eed SHA-1: 680461067f2175a9ed3003976a4cc255d4373c43 SHA-256: 0a599a38dd70fd3e55f4e0bf1b4078b074b7400ce2fa2b493fe6dd0a71bbd9c5
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a potential distribution vector for further malicious content or phishing attempts. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the link farm heuristic.

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.
  • 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 http://dorutote.scienceontheweb.net/fatejijoli.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387921/normal_5ffe413a89119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_601fd91754d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_6047a9abc9871.pdfIn PDF document text
    • http://nigigalewo.iblogger.org/cadence_spb_17._2_crack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_6031b2b2176e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_602b11c34ef9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_605c666ca0e21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_6006a193d1f15.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/mecanica_vectorial_para_ingenieros_estatica_10_edicion_beer_espaol.pdfIn PDF document text
    • http://debuged.mywebcommunity.org/ms_excel_2020_tutorial_in_marathi.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/39276415494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=soundarya%20lahari%20meaning%20in%20kannada%20pdfPDF link annotation
    • http://zebofazedixa.rf.gd/htn_medication_guidelines_2018.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/what_can_you_cook_in_electric_pressure_cooker.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_fe27034ab78b4158914519f3d52c0ac9.pdf?index=trueIn PDF document text
    • http://mutodavop.rf.gd/12968640135.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_2845311606cc46458a4c1f402967965b.pdf?index=trueIn PDF document text
    • http://wonetone.rf.gd/gafireroga.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B000 5544 bytes
SHA-256: 921be70ea413a95972c3937ee17eb80b62168094ec7abd99ecf5e3edd5715cb7
font_01_sfnt_off0001c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BB 11008 bytes
SHA-256: 81d3144e132da7d5daf4ddb78e3fe16621f4bc13036e632d318df1e4ee66b4e4
font_02_sfnt_off0001e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E86E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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