Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6d2d9ee1b1d451…

MALICIOUS

PDF

69.0 KB Created: 2021-03-31 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 330ea63962e5a7c9c97eb417c1ae15ce SHA-1: e9157e0da3744faa75e4dfac50889912f694713b SHA-256: db6d2d9ee1b1d4511eb226ac75ab245a17ced3c3530f31b0029bb60a7e25d30c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, with one notable link farm heuristic pointing to `https://s3.amazonaws.com/piwanisaj/list_of_all_irregular_preterite_verbs_in_spanish.pdf`. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=both+either+neither+test+pdf PDF link annotation
    • http://raisinsapp.club/how_to_describe_sunlight_through_trees07scb.pdfIn PDF document text
    • http://shop50off.info/tragedy_of_the_commons_summary9kdzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fd340b6ea9a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_6004a4065c141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_605ae317839dd.pdfIn PDF document text
    • http://yourdesk.website/smart_manager_apk_download_for_androidvjor9.pdfIn PDF document text
    • http://nexusisuperat.22web.org/vadasugul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_5fed25ba97254.pdfIn PDF document text
    • http://wiinorama.fun/wewidi3r5xz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6026b4b130675.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/piwanisaj/list_of_all_irregular_preterite_verbs_in_spanish.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_9e7cf79e42df42f4a7ec7f36aae87944.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/android_tv_or_samsung_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/86160828134.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_67e0878667b54762a3e80aadcdbaa646.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_f40cccbc4d8c49ff9123be2c0364aabe.pdf?index=trueIn PDF document text
    • http://keladuwuk.rf.gd/microbial_bioremediation.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/4677069127.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/55204338277.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_397ef0aab01a431aade13deee7f5ee12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/5_tab_clear_label_divider_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/nomapoxanejilofusovubo.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/kexanimomisup.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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 4936 bytes
SHA-256: 0786587f4513ba9fc3ad525d9227aa20cbae9d14739bd708218625d601491922
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 10280 bytes
SHA-256: 8a6295a72f61c7d52254ae50e56494ddd071e2c4dd0e45327668c1b980178f51

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