Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ece25b6a3b2cd7…

MALICIOUS

PDF

95.3 KB Created: 2021-03-28 01:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f9df53b0883cbd1fb4abc5cbb811337 SHA-1: 99b1de670d0d641d6f2488af0f86d686f734cdec SHA-256: 20ece25b6a3b2cd788273265da644c7f6d941af14e4a4ae808fba4f179fb0a6d
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external URIs pointing to potentially malicious domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the structure suggests it's designed to lure users to external sites, likely for phishing or malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://maypoin.ru/award?keyword=babulal+chaturvedi+calendar+2020+pdf+download PDF link annotation
    • http://moperala.iblogger.org/90807808252.pdfIn PDF document text
    • https://nazoturifebigik.weebly.com/uploads/1/3/1/6/131606271/6f5dd7a407.pdfIn PDF document text
    • http://xitnet.fun/nikafoq6978.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/pomasa.pdfIn PDF document text
    • http://xezuviwejugume.22web.org/vunofedaba.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/3286495.pdfIn PDF document text
    • https://pijutizomi.weebly.com/uploads/1/3/4/6/134686964/eccd2.pdfIn PDF document text
    • http://bossyonlinex.com/xusuwazotonuzitefck29r.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/365774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/read_sherlock_holmes_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73228e59-3d2d-404f-8a2b-82a6ccc8d127/19926281472.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/33706268752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fe25f3-4a2c-49df-9490-bec41330842f/77556050361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a359ba-b0aa-4f6d-8968-1dcbe7d36234/isyoung_automatic_pet_feeder_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06afa55c-2b95-42d7-9e8e-027bd4614ef6/how_to_draw_a_person_head_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d7b9ef-0ee4-4e82-bb72-2645a7691240/red_rising_pierce_brown_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d7bb58-553f-47f1-bea1-a8a2a422bc6b/59216343344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34911119-3de6-47be-901a-4513e0822ec6/2013_jeep_grand_cherokee_limited_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5c9886-b197-4af8-bef6-d735b868d3f3/around_the_world_in_80_days_full_movie_download_in_hindi_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3fd2c3-3a93-49d2-b671-ffd9ae9afec2/sometimes_the_road_less_traveled_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/democracy_citizenship_and_capitalism_all_qualify_as_being_social_inventions.pdfIn PDF document text
    • http://zamewoj.rf.gd/78072527005.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/biwuv.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 5680 bytes
SHA-256: d487a18eb435a57bdc0364cfb5db74b769bb0a020645b99b17256a91ad594cb5
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 10540 bytes
SHA-256: 35f930589cef9beb3fabce31851f53b1302e8c25fa5d7891079f67e88aec8ab3
font_03_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 14384 bytes
SHA-256: cf7074ce522487c964f0311d2808baab76239f5ed58e86994c6c8f34533f7bc3

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