Malicious PDF — malware analysis report

Static analysis result for SHA-256 751cdcbf85cfa666…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 12:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 856db0352442416e10bec02ff9448546 SHA-1: 075e74b18f1d090c46152e5501a7bb9387d55ebf SHA-256: 751cdcbf85cfa6666be419eae74e83d1606480953faaaf3af3e3206180bd05de
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or phishing attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=ck+12+meiosis+answers In PDF document text
    • http://nomokesus.sportsontheweb.net/genetic_engineering_journal.pdfIn PDF document text
    • http://fito4ka.xyz/79667738243e5bl9.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/01b630c4408df.pdfIn PDF document text
    • http://kino-vezde.ru/tolotulegoda3rw8u.pdfIn PDF document text
    • http://italia-doc.fun/lightbike_2_mod_apk_unlimited_moneyye4dh.pdfIn PDF document text
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/57737.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/mupuki.pdfIn PDF document text
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/gaduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fe6e0ae8ac90.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/gavizosenumifubofuwedimi.pdfIn PDF document text
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/350de8a5d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_60253bd14d7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_600aa9936b720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fda7aa082f13.pdfIn PDF document text
    • http://meetsucre.pro/kivejipazimanknkbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_603fcc5930a4b.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/jirebonudur/16888442174.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/heckmondwike_grammar_school_admissions_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/zezasejobupojamolosewesa.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/97275330452.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/how_to_make_an_option_trade_on_webull.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/rockabye_song_320kbps_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/67944652698.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/77243753266.pdfIn PDF document text
    • http://koxolavomuzo.myartsonline.com/icao_annex_17_10th_edition.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_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 5044 bytes
SHA-256: ea7c9927cb971c890adb0e565821be3d33f6e8666deeb0f19e9c6a5e44259bfa
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 10296 bytes
SHA-256: 82c27f1a422f360289c8eb3793137a724a3dd98fb866bea90c0896ad04ecbb79

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