Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35106bfb3a39530…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 18:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 988054d5b1937ce7b72c1e6a163bc993 SHA-1: b7b8bf44a25f545a29c012ba1842dd067abeea3b SHA-256: d35106bfb3a39530e894533c747da671b407ceba49f39ade7f02a566ede8dc26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary focus on `https://golowaki.ru/strik?utm_term=how+to+use+shark+mop+steam`, suggesting a phishing or malware distribution lure. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=how+to+use+shark+mop+steam PDF link annotation
    • http://smartradiobf.ru/storyboarding_en_francais40y0t.pdfIn PDF document text
    • http://jumbochecker.com/consumer_reports_jobs_yonkers_ny1qork.pdfIn PDF document text
    • http://sajitalunaded.22web.org/how_does_the_martian_chronicles_end.pdfIn PDF document text
    • http://wezutoxizuwal.22web.org/athene_cunicularia.pdfIn PDF document text
    • http://www19216801.site/dimuxijenuzonisenefafpozo.pdfIn PDF document text
    • http://antinomi.design/agenda_diaria_2018_para_imprimiresekg.pdfIn PDF document text
    • http://mgacessoria.online/fuverotaxumuf94vp.pdfIn PDF document text
    • http://smartycredit.info/luzazirujagogugubujevwf8i.pdfIn PDF document text
    • http://mgacessoria.online/minecraft_building_guide_book6ov59.pdfIn PDF document text
    • http://seluluxafej.22web.org/ternyata_akhirat_tidak_kekal.pdfIn PDF document text
    • http://olivamebel.com/how_do_i_reset_my_insinkerator_hot_water_dispenserfqos4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemeterotef.rf.gd/54805602691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b276b9-3f53-4e47-86ed-2347a8ba03d3/47581267432.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/nancy_drew_and_the_hidden_staircase_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/vuvudajelexuvapuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/washington_post_subscription_amazon_prime_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669fa8db-5537-43b1-a3ea-1ae18963d1ba/34002997952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be7dc1f-b22a-4375-9c81-e24f77fcbf7d/ncert_maths_book_class_7_solutions_chapter_2_exercise_2.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710b6147-1d67-48bb-bdd8-ea9ce744ef5c/domakasitukezadojebawe.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/59875582481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05ec97e-4928-426c-90dd-fa3310d84ab9/what_is_descriptive_analysis_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be93658b-94db-40b2-96ca-181d7aba2478/excellence_el_carmen_punta_cana_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24129485-73eb-4a47-822d-435e8b7304ed/4368768426.pdfIn PDF document text
    • http://fogigekitomug.rf.gd/59988729641.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_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 5144 bytes
SHA-256: e820fb355ff125f419c9e434b640a7be31995f471649fc297e2b96c774d6564b
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10768 bytes
SHA-256: 4259b493a05d60aa00838dd7ce7be59924f11decf83c3628146b149b1379beab