Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee621a7dfad2e5c9…

MALICIOUS

PDF

77.0 KB Created: 2021-01-14 15:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bea689d3c2c4ccafb3d24019280d3803 SHA-1: d68d8d857858e17c28308cf5e69d1c5d5d80c9d2 SHA-256: ee621a7dfad2e5c90d7a402690ce268328d9e498a77eabcd43e3e81af9d11d66
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to disposable hosting services and redirector infrastructure like traffking.ru. This strongly suggests a link farm designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=sapphire+blue+pdf+free In PDF document text
    • https://site-1172793.mozfiles.com/files/1172793/49901323129.pdfIn PDF document text
    • https://site-1180277.mozfiles.com/files/1180277/44782313798.pdfIn PDF document text
    • https://site-1178383.mozfiles.com/files/1178383/62891404016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_5fe7fe2e5e51e.pdfIn PDF document text
    • https://site-1244787.mozfiles.com/files/1244787/beyblade_burst_rivals_apk_unlimited_money.pdfIn PDF document text
    • https://site-1178383.mozfiles.com/files/1178383/19423784919.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/d343f.pdfIn PDF document text
    • https://site-1176996.mozfiles.com/files/1176996/shelter_island_san_diego_marina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5fadf7c63c35d.pdfIn PDF document text
    • https://site-1174461.mozfiles.com/files/1174461/riwupowowatadowemodogok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fc3cec71696b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5fb25d49420d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_5fb4fd7a53076.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://s3.amazonaws.com/wibadinavosunom/20044884795.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 4780 bytes
SHA-256: 54c821de9f0345a9b8bd83f1467aef10e622ca040d3fc539809b31065e0a4200
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10840 bytes
SHA-256: 302b05de32150fc01b37e2b513aba05a2b46794e533c1bead041b378f9265c4e
font_02_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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