Malicious PDF — malware analysis report

Static analysis result for SHA-256 703526f02a0216cd…

MALICIOUS

PDF

75.2 KB Created: 2021-01-10 09:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 100e8b2863c99adabc652ee40c63c43f SHA-1: 6dd6673356a9ea2b150694b8cd6b9ce2dcda0791 SHA-256: 703526f02a0216cd83fd7973aab645f970f6b2e2270a1564b98740300ca977b2
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The primary goal appears to be directing users to potentially harmful websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://traffmen.ru/123?utm_term=skyrim+special+edition+black+face+bug In PDF document text
    • https://site-1176021.mozfiles.com/files/1176021/cashier_3d_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_5fa9c33f62356.pdfIn PDF document text
    • https://site-1177329.mozfiles.com/files/1177329/monument_valley_weather_year_round.pdfIn PDF document text
    • https://site-1244719.mozfiles.com/files/1244719/lincoln_tunnel_traffic_report_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427273/normal_5feb2b9d57ffc.pdfIn PDF document text
    • https://site-1180825.mozfiles.com/files/1180825/land_rover_defender_110_review_2013.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/xowab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5fdd655ba14d0.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/deliju.pdfIn PDF document text
    • https://site-1176979.mozfiles.com/files/1176979/12222151234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/9997010803.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/kendo_ui_grid_template_onclick.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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 5884 bytes
SHA-256: bcbc177b05316c45985adbeb27a04674b0c4cdd9e7e6a66fd74124daadef1740
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10560 bytes
SHA-256: 21ab199d3cc399ffbb4e2bca28ca4abde999b0857b73895b04e21aab0fc5eb7f

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