Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc8d97592859be4…

MALICIOUS

PDF

129.6 KB Created: 2021-03-09 01:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 06ecc205efc4214335431981853339c4 SHA-1: 2c6fb5a5bec48af2d1436f9fd72ed5dd9d22063f SHA-256: 0cc8d97592859be411dacf2b734acde9a85971ce669b378131694aced03fe2d4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external links and the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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/strik?utm_term=what+were+2+major+causes+of+the+european+renaissance PDF link annotation
    • https://cdn.sqhk.co/zozimevoket/iaHgchd/zombie_apocalypse_survival_kit.pdfIn PDF document text
    • http://retys.fun/bseb_ofss_inter_11th_admission_form_2019b1bil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5fc61e71cedc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fd2a44148598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5fc83e5728caf.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/the_standard_401k_withdrawal.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/ghjiKie/vivotu.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/how_do_you_find_your_gpa_on_infinite_campus_student.pdfIn PDF document text
    • http://meetsucre.pro/92292345897hf41m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_602b2ab06afdc.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/ggksfar/11061084191.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/balewugisibolomen.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/hdglSie/tosusuwuber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fe1564a1b81e.pdfIn PDF document text
    • http://crispyset.online/simile_metaphor_worksheet_middle_schoolqkoo2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_6034936515a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_6023e0c941801.pdfIn PDF document text
    • http://ital-tess.space/bookmark_widget_android_appuiins.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://uploads.strikinglycdn.com/files/8dc7a798-dcb8-4a46-b449-579dc50b9471/60548390647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69af2fe5-163f-40ab-a2c9-f390ac65810d/6198185683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946a6d4c-ce55-42ec-ad4c-33c888026185/binofegemasavibidanapav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8f4687-1b62-4394-ab9b-7fecca53eaa2/misery_stephen_king_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e978d107-3c51-4361-aaaa-f9a9a21dfffd/46638489508.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_off0001af76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF76 5420 bytes
SHA-256: 3be4c883e9a820eaea510479dc4ded6916177a5874e423b5d56ea0e82aa4f070
font_01_sfnt_off0001c1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1E2 12308 bytes
SHA-256: b7a252221795aaee5cb2f47cf3258301dbda9c3e581dbb35d90a30297b83ff4f
font_02_sfnt_off0001e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9C6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c