Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff4fd22b934367f…

MALICIOUS

PDF

79.8 KB Created: 2021-05-29 12:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f5775e75f60b2b73fca7b5105e852ee SHA-1: 216c833df538feb67de72163d9a7c86c5089a715 SHA-256: eff4fd22b934367fcb6969f5ed382c51d97cb055dbd308bf3b333f90fab1b700
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed for SEO manipulation. The primary malicious URL identified is https://yafferge.ru/strik?utm_term=facebook+gameroom+download+for+android+tablet, which is flagged as a malicious redirector. The document's structure and the presence of numerous external links suggest an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=facebook+gameroom+download+for+android+tablet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_6051f8a8deb5a.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/wexidusebevijes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_60159d15310a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6013c0df5f6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_603ab5fce17e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_601b4d3a25153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5ff5e55d975fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_602f28927c3de.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4423442/normal_60b0aa6086016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5ffcbbb5e63db.pdfIn PDF document text
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/a9059f83.pdfIn PDF document text
    • https://lumikefobebodas.weebly.com/uploads/1/3/4/3/134324067/f59bb9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_5fdd21c721f1b.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/9d7d2a6c-fd09-475c-82e9-1940498258c1/jolesazefuwudufimekoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e79edab-e897-4493-888b-50f8d1042073/lys_edebiyat_el_kitab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc60264-e2c2-422e-b8f2-a7ae3fcac18e/13849961835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e4a675-e51d-4466-981f-3bb9b9d087cf/89071712617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0460a6dd-9638-4638-b2a7-de6f19188516/is_john_a_gnostic_gospel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e92be3e-e188-405c-9dd5-ec27b53d9650/the_witcher_audiobook_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a13609-f606-4142-aa0a-c13863639e7a/the_australian_city_of_perth_fce_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 5412 bytes
SHA-256: 0fc72cc86846bbc10f736cb5c2ca42a6862aed9ddb651dde7256ba1e13e73d79
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10680 bytes
SHA-256: f04dcfd0947698b75a2e10cddf60c988d7e97d06c819d030aaa17be402f375b2
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 16140 bytes
SHA-256: 51ac3d1f1bf98930754243335fece15be8d310c823d1fad463109d412a26d3a1