Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73cadb7561cf47c…

MALICIOUS

PDF

81.7 KB Created: 2021-04-15 08:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f8e87cac35e4562f5e51eb67e8c4a70 SHA-1: 595c063ef98582f82c1c07d1a36c568fd1e0711f SHA-256: a73cadb7561cf47cabe70c61f45ff917060ce24e4f7b0e496ccce980db5e5c27
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=genie+intellicode+keypad+forgot+pin PDF link annotation
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/5319874.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/hYifS5d/trick_shot_masters.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/7f2aeeca6.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/mavimufopugilu.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/6870b3d394719e9.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/RsYghgf/maximum_care_warranty.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/kopif_zugulobuvika_mevamifalu_rolibipinawaza.pdfIn PDF document text
    • https://vurovovi.weebly.com/uploads/1/3/4/0/134040995/vugebetamiv-nodewafu.pdfIn PDF document text
    • https://cdn.sqhk.co/zoravuzulop/anhYx1l/fagiwa.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/duvajozubo.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/MgehKQG/forest_river_hd_pics.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/kaxad.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/fojb4z6/occupation_2._5_apk_mod.pdfIn PDF document text
    • https://tetoferapijala.weebly.com/uploads/1/3/1/6/131606168/fajumos_vamojen.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/Emibrig/83867326087.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/kuzixenoz.pdfIn PDF document text
    • https://daxapiruxibi.weebly.com/uploads/1/3/2/7/132712323/vobozotewiwutomano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b76893-541c-442a-a70c-f33622104f42/vunejuwofijawuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a685781-96c4-44fb-865c-38f6b7076eeb/tupolaxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335d9a35-1cc1-4aba-b2be-7fe2f5454279/lord_of_the_flies_chapter_2_summary_study.com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0f9a98-8b4b-45ae-8af7-24e4008fc173/saruvisubinom.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_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 5344 bytes
SHA-256: 49d9f1308149c394cf4d88d63ddb05b9cb15c26c675b62045c09dcdc3b6caf40
font_01_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10772 bytes
SHA-256: 99dce08aa652090f929f4da78d979766d906a036fe8e157aa505862a24e0b39d