Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4c878b025deedd…

MALICIOUS

PDF

70.5 KB Created: 2021-01-14 00:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 24f866bd8d24a7b5c79cf332f7199ee4 SHA-1: d80e7d08ecb05a892e983644006988f0d12f9fbf SHA-256: ba4c878b025deedd53590789957d237311b78b136e4435bbef5196aa76385ed5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, suggests a phishing or link-farming scheme designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffi.ru/123?utm_term=2nd+grade+age+group PDF link annotation
    • https://site-1174796.mozfiles.com/files/1174796/ryan_world_toys_net_worth.pdfIn PDF document text
    • https://site-1178548.mozfiles.com/files/1178548/95803664756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_5fe91232143a6.pdfIn PDF document text
    • https://site-1173508.mozfiles.com/files/1173508/quadcopter_fx_simulator_pro_apk_obb.pdfIn PDF document text
    • https://site-1177405.mozfiles.com/files/1177405/tip_top_chicken_plant_marietta_ga.pdfIn PDF document text
    • https://site-1180061.mozfiles.com/files/1180061/play_store_lite_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_5fbd79208dfee.pdfIn PDF document text
    • https://site-1173426.mozfiles.com/files/1173426/sheridan_sheet_reviews.pdfIn PDF document text
    • https://site-1211890.mozfiles.com/files/1211890/50736535326.pdfIn PDF document text
    • https://site-1177662.mozfiles.com/files/1177662/w3schools_javascript_quiz.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/falevi/25044261720.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/30921212203.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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 4952 bytes
SHA-256: bb3ddeb1685db996f547616b416959c445f038fe21fd709376f06c95fc684e0e
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 11016 bytes
SHA-256: bf34d644a5d66e3319a9169401df03f38eff7a5c10ac9db0a97292d0cbd0ccb1

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