Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0e01bf7f74c120…

MALICIOUS

PDF

84.4 KB Created: 2021-05-25 09:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcbd39d1824aae15737d84399d19ed4e SHA-1: c6125055fb4b5f0a7b605f149b07dd2a54b22e0a SHA-256: 8e0e01bf7f74c12085308d51ad293a7e85d3837148d9da52c81390f8f7553be2
196 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to SEO-optimized redirectors. The primary redirector URL, https://jacksth.ru/strik?utm_term=grill+floor+mat+for+composite+decking, is used to lure victims to potentially malicious content. The presence of numerous links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=grill+floor+mat+for+composite+decking PDF link annotation
    • https://mapogukokerezat.weebly.com/uploads/1/3/5/9/135987870/penuvufidokirafemogu.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/jolugisid_wuveweduf_padamogas_zewukewubol.pdfIn PDF document text
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/zubogugokuseredivavu.pdfIn PDF document text
    • https://tatujudipopef.weebly.com/uploads/1/3/4/6/134605081/a2c97.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/sutakiwibodoxe_wowujizijov_gorefofo.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/486f823a-5743-4dbe-8be3-e9b2a0aa047c/hp_deskjet_3050a_j611_how_to_connect_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f03c87-c553-454b-b4e0-4ed826853ac1/fahim_the_little_chess_prince_full_movie_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/nana_acheampong_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/nisasumiguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1409890c-0b38-465d-9250-d6b20184d735/best_english_learning_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/how_to_learn_coding_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec1f1ea-1e35-4262-8905-85b7d1356685/91866723233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71769019-1a64-4823-9af6-57702e89a7c5/wijusel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45be76b-1cb3-41a0-81ce-235f4fbeda05/monsters_a_bedford_spotlight_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea00190-06ed-478c-9c69-01b0c1a55763/america_the_story_of_us_episode_3_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47705074-21c4-4e92-99e6-631ed7dbbcdc/83179411901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdcd47d-e0c4-421a-8282-6fea6c935c0d/bounty_hunter_lone_star_pro_metal_detector_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e0cc58-1656-4788-9449-8f48a62bedac/handbuch_zur_deutschen_grammatik_6th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae070b1-8445-454a-b447-b187e3ec59bf/is_the_book_of_jasher_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa997b38-5667-4866-a511-8bc559da7dd0/how_to_share_live_location_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a119f4e-0397-4417-998c-cfccfe1f9b21/33130769078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7d727e-b754-4011-9e16-fa093c7b63d4/t_table_one_tailed_vs_two_tail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf8de10-3374-4c1a-8371-a619eca1db46/ridufofikarezemejaz.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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 5356 bytes
SHA-256: 3a3a7afff88764a8a3d59c00193cad895f082f411478af2f6391db1684413d15
font_01_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 10740 bytes
SHA-256: 52761c0ccf95e8d3e720601a45cd2dd6e452ed04394db30832f05c86df41ed08
font_02_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333