Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b11b3178c0ac366…

MALICIOUS

PDF

110.9 KB Created: 2021-04-23 01:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15457a6ac6a85f3066dc67b0c506f5f2 SHA-1: 0ddebc81c28cbe48da5689e957cf3440da8a2629 SHA-256: 3b11b3178c0ac36679a21745ea96bd493e79e12a8a17d4cae487a334da4af41e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=magnum+ms2000+inverter+manual PDF link annotation
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/38d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_6063c5d8f265a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fde6cbca2a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_600d16506fc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_60685611adf5b.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/zokida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_6023d6ab595ae.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/gururelitaxu.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/juliluver_losusepax_tolunewomolar_vujodasareg.pdfIn PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/duwajoguk_pibos_tawonipog_zebibuvegof.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/9463091.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/ruropi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_6022cf423bc24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_cfa4fb151f514a888d65f110a6c041f9.pdf?index=trueIn PDF document text
    • http://vudetelutineb.rf.gd/zitofovigakegagoroxoxe.pdfIn PDF document text
    • http://dogiperij.epizy.com/lakexorixumagasukatax.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_fd092f06148e4b709f7f40f721c0052b.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_f1fe790b6ded487bbb2020e5ea069794.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000166a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 5116 bytes
SHA-256: 869985f175157fcb738a3a327223102dbf393c7fd38ce047b74784276fb403c8
font_01_sfnt_off000177fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FA 11892 bytes
SHA-256: f33e7e1b336dd4ea0c53de882e63ee53165cb4ae8282b1e2d542047a2a61ea01
font_02_sfnt_off0001a053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A053 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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