Malicious PDF — malware analysis report

Static analysis result for SHA-256 2496c3b119b46f46…

MALICIOUS

PDF

76.5 KB Created: 2021-03-16 21:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 89ee4f565de42eeee1a77fedb0168549 SHA-1: 84ae383bb11daf7b28e22a2e8a18655fae54cba6 SHA-256: 2496c3b119b46f46dd56030598713215398ea92496163d225349bb16898d598d
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent. While no scripts were directly extracted, the PDF structure and heuristics indicate it's designed to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://resalured.ru/award?keyword=cantilever+chajja+reinforcement+details+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386836/normal_5fefd353986f2.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hhhiwMl/best_electric_vegetable_chopper_2019.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/lexesusojufo.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/dokiwini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5fcad148e6ab7.pdfIn PDF document text
    • https://bojetenabadi.weebly.com/uploads/1/3/5/3/135394614/sawob.pdfIn PDF document text
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/divizafapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448545/normal_5ff1113cf2c24.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/cNifOhb/the_silent_age_chapter_1_part_2.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/f7gegf8/13709299020.pdfIn PDF document text
    • https://cdn.sqhk.co/dovepomazeri/c9gij0I/smart_and_final_fresno_blackstone_and_clinton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_60393b96df172.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/ggSzjgX/idle_slice_and_dice_mod_apk_android_1.pdfIn PDF document text
    • https://besaxujujugolu.weebly.com/uploads/1/3/0/7/130739491/lefitudiwo.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/dozuga/chitralahari_video_songs_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/50807216843.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/ovulation_calendar_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/adverb_of_place_examples_list_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/27813339605.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_33597482fab1436c91c6fae1ff3c5530.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_51b69a8e1248414e8e9153c0602d9140.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 5436 bytes
SHA-256: 5c7cfec8c4ce2614e0dfeeb1f9564616ef6e8d7be36b87c09d47a1c6565fc043
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10988 bytes
SHA-256: a4d65fbce4da47adb0cd48ca0304b4069485ec4bd2bb517571d6f8a3e58c8a54

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