Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f46e358484971…

MALICIOUS

PDF

87.3 KB Created: 2021-05-21 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 988e30ac1ed74d79a962dc19390fc9a4 SHA-1: eda8a0220a21c7fad084933a693dcf336523c19d SHA-256: 4a6f46e358484971f5450c210363d4f3bfd51e09cfeac5ab4bafef3d81a2f461
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wb?keyword=web%20services%20api%20meaning PDF link annotation
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/db2105e5339b.pdfIn PDF document text
    • https://visuriteja.weebly.com/uploads/1/3/5/3/135323353/9085390.pdfIn PDF document text
    • https://fadinozejekoxoj.weebly.com/uploads/1/3/4/6/134659303/lanuzizexudigubi.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/ac24bc3475141d1.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/lokokoxunapid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_603a5e6f7b853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418587/normal_5ff20fbaa30a6.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/sejupokazakofus-lebufevewagiw-tulefudumata.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/400a7.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/meranajelutapokolibi.pdfIn PDF document text
    • https://rubirilubuz.weebly.com/uploads/1/3/4/2/134266621/sebaburedezenizom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_603d7e706bcb2.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/4506304.pdfIn PDF document text
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/rugekuvezekalin-sekiverilu-lisofamogizexo-vularugudumuwe.pdfIn PDF document text
    • https://xurigaguk.weebly.com/uploads/1/3/4/6/134635426/7009845.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/nafoxuda/stihl_weed_trimmer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/53874580851.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/rurubi.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/la_amortajada_personajes_y_caracteristicas.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/how_to_use_engineering_lettering_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/wizoramerujef.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/99693274382.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/25908530200.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/how_do_i_change_the_time_on_my_armitron_wr165ft_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/alora_sealord_songs_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 4596 bytes
SHA-256: 4203d18571c8afbbea32518c1b7b996d5582cdb6ebca979a9149677f19de301f
font_01_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 5432 bytes
SHA-256: 48f42c1db122d132c7e7d36f54187ba896fa23e6d00ce85f8e7bbd29f9d08e3e
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 11516 bytes
SHA-256: 9451938fec7f42ac5341302ee9063db04bd167f75ab971a389e467e802d26f90

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