Malicious PDF — malware analysis report

Static analysis result for SHA-256 4068534b81afffbd…

MALICIOUS

PDF

71.3 KB Created: 2021-05-22 15:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8632c0b1f676a5a181e107759cd73822 SHA-1: 712fdc435e3ac314f7044b14f16d431d389ec7fd SHA-256: 4068534b81afffbd71c5fcc25f32b235c51e9359aa2e0e0600b87818abdca9ac
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to unrelated content, indicating a link farm or SEO spamming attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=fichas+actividades+de+lectoescritura+para+primer+grado+en+imprenta+mayuscula PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5ff55c54f16ff.pdfIn PDF document text
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/nusireza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5ffff7f9ea0c4.pdfIn PDF document text
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/ropeguzobekerutadi.pdfIn PDF document text
    • https://judikudaxu.weebly.com/uploads/1/3/4/8/134878276/f96ddd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd8213212053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_601de882b2acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_606c44a9d8769.pdfIn PDF document text
    • https://jabofewikan.weebly.com/uploads/1/3/1/4/131437477/xuzosixosaw.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/suzujewa/teamviewer_10_free_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/cazadores_de_sombras_los_origenes_principe_mecanico.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/what_to_check_when_buying_a_new_car.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/pibugimutemegotefituwuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/codycross_answers_group_45_puzzle_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/studi_umanistici_e_della_formazione_firenze.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/95978234603.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/xomeditujavuru.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/zozeviderunapemedejuxemad.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/arduino_mega_pro_mini_datasheet.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_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 5604 bytes
SHA-256: 17cfb3792500b34500f9b3083eb8dbceb83e59e940485fe6cd2051ce775dad7c
font_01_sfnt_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 11724 bytes
SHA-256: d179ea833da01f8605ef37fe69bedd9d641e63c51d43476ab0508a2d7781f1da

Open this report in the interactive analyzer, or submit your own file for analysis.