Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9703f6d8c04354…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 18:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a01d88833e4b1f16185090027a72385a SHA-1: c5327452a34120f438a8011cf3f92eaefc758f22 SHA-256: 7d9703f6d8c04354c9033def24472e145345eec09108705eddde339900eeddcf
186 Risk Score

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 0.9996

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://botokaw.ru/strik?utm_term=microsoft+visual+c%252B%252B+2015+runtime+error+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5fe99c2967058.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/2AibfMK/22144602632.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/diibqY4/dupobasazogibiwug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_605c0075bb0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_6049706531389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_60462ae146f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_60571bb7518f1.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/28616683919.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/54708919307.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/migavavaxet.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/what_does_tantric_mean_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/zyUnjam/jimmy_ruffin_greatest_motown_hits_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_604f352162252.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/hcGhgX1/idle_crafting_empire_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_4fe059e0f8074be79d87ee7f63dcaab3.pdf?index=trueIn PDF document text
    • http://kagijido.myartsonline.com/gigejajujur.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/where_is_the_drain_filter_on_a_lg_top_load_washer.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_88d26330a65a4d7fbc771f2dd5da5fb4.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_547fbaa2ede042569e33efafdd5d405c.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/23345350761.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_b5ab1f9edfb24e86978ebc2c33779fd3.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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 5776 bytes
SHA-256: 4c7e89ef843ac5f0d70fc00366dde70ff26b32252de7f1e0fdd2b4f89bf94665
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 11636 bytes
SHA-256: 604c4a4ecb3e39a00ed15b94a201c6e363bcdd8b2ce66baf68d8f76a233d94dc