Malicious PDF — malware analysis report

Static analysis result for SHA-256 4850091775e50ff5…

MALICIOUS

PDF

78.0 KB Created: 2021-02-27 20:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28a5fb8b53612d71725a5212a05215a7 SHA-1: 2b4a4a3204bf98c7bf1327f33e6bdcf63a153932 SHA-256: 4850091775e50ff566d64cd5f38a681a12c9dcdf07525d9c1acd4c0520f3727d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains, indicative of a link farm designed to host malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/wix?keyword=honeywell+quietset+hy-280+manual PDF link annotation
    • https://cdn.sqhk.co/lukedivibeb/ja2hhjb/tactics_and_srpg_mod_apk.pdfIn PDF document text
    • http://cocobeautybar.ca/221381303359tcob.pdfIn PDF document text
    • http://hempmap.ru/are_lg_sound_bars_any_goodje1ks.pdfIn PDF document text
    • http://trackengine.host/how_do_you_test_a_48_volt_golf_cart_charger8cdpa.pdfIn PDF document text
    • http://casbah2point0.com/45966543284qyy54.pdfIn PDF document text
    • http://texno3ua.com/bmw_x3_f25_service_manualqxkbw.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/odhhjid/bokakunanemimizixesat.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/zpy6qic/kewepavumaza.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/tavomik.pdfIn PDF document text
    • http://acupofjacob.com/math_giraffe_slope_intercept_form_answersvebuw.pdfIn PDF document text
    • http://prognoz-football.club/49494404588r627n.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
    • 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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 5492 bytes
SHA-256: 0c2a9183d89d8d1887303c1dd56b98d10c16b0f2f691fb7dd48826dd96398d56
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10988 bytes
SHA-256: fa7004e0a9842b3fea11f6c2c8ebf6981ebae37ef38ca56bbd5018b3d1c23b5d
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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