Malicious PDF — malware analysis report

Static analysis result for SHA-256 289688b5cc96f39c…

MALICIOUS

PDF

92.5 KB Created: 2021-03-25 01:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81dcc06a9b70028bf06d74c634ac44cd SHA-1: e23bfb2f25c899a41412899508a1cc501178e4d9 SHA-256: 289688b5cc96f39c4449d2248139d0b2d56df69fb492c83f8c5e1e7201e60151
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'Pokemon fire red complete pokedex cheat codebreaker', suggesting a lure to attract clicks. The presence of external URIs and link farm heuristics, combined with a high ML classifier score and ClamAV detection, indicates malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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=pokemon+fire+red+complete+pokedex+cheat+codebreaker PDF link annotation
    • http://devlp.club/scansnap_s1300i_mac_mojavehamri.pdfIn PDF document text
    • http://prodit.space/tales_of_symphonia_final_bossi4bq3.pdfIn PDF document text
    • http://ericksandoval.com/ferosizuwopixatinabog3bo4h.pdfIn PDF document text
    • http://freud.icu/vapekesabubumakobozatabecvfh9.pdfIn PDF document text
    • http://pay-order.info/airplane_pilot_simulator_3d_mod_apkis33g.pdfIn PDF document text
    • http://wosojedawujemi.iblogger.org/important_days_and_themes_2020_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0609f5-a9b1-4200-ac26-f740f587fb28/bosidasurixoxizo.pdfIn PDF document text
    • http://vusejukulerubip.rf.gd/xorokosapikufobazorujolab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bef0c8-4433-4562-a5b4-9925f22a03fb/how_to_use_a_polaroid_one_600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cfc1e8-3fea-4c1e-9b8e-31be3eded830/davis_vantage_pro2_iss_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e54b040-ec71-4991-8839-7027d70713da/mokasiwofotenaxusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d24b87e-cea1-4f5e-af36-2399231cb466/beats_by_dr_dre_solo_hd_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb47fca3-9cf7-4f82-8aaf-6ecca5ca5d6a/assistant_manager_customer_relations_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b818f419-9bc0-4705-9061-a2340ea74901/is_i_go_die_dead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc29ca1-454f-4167-acfb-ff73424bbad0/how_to_play_turntable_through_soundbar.pdfIn PDF document text
    • http://rinubokuj.rf.gd/best_washer_and_dryer_set_deals.pdfIn PDF document text
    • http://vafukibugaf.epizy.com/osrs_fletching_guide_1-_99.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_fab0e6c4b8b8401584946917b571412b.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_62ed211ea258440dba8e067c0bbf882c.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_efd8034a989843f89a1d83cbe6034f32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57522ef-3cb6-44ef-aa23-0438c54c1813/famajemezek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a37f10-12c1-4f5f-b671-e27b7fe67db4/what_does_bao_bei_mean_in_mandarin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599189b5-a044-4932-8dd1-9749bba34d12/sugeditizumifojukofelase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0ffb98-64e2-4818-8418-0ba6037c2bbb/practice_tests_for_parallelograms.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_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 5492 bytes
SHA-256: 32e01817f278ce588b6ab24a672b46e966def673f93a97e29424ad5b4d8d9cd2
font_01_sfnt_off00013cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFA 11220 bytes
SHA-256: f94729b450c04b1893ddf8471b314a3399abdfebba0f905dfcd01a4af8d2e736