Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3474b5ca089bc28…

MALICIOUS

PDF

79.8 KB Created: 2021-03-05 10:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f286671aff68b96268050c19fb305e8 SHA-1: c3f79edb9c6956dfc8da3c299a68f726f5402a3b SHA-256: f3474b5ca089bc28d25fe7cfe027eda47bae211982ac6ff01a34f9a494e605eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-related links suggests an attempt to drive traffic to potentially malicious or low-quality content. The document body, though heavily corrupted, contains keywords related to Minecraft mods, likely used as bait.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=minecraft+clothes+mod+1.16 PDF link annotation
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/lijerotil-vexutusofaruv.pdfIn PDF document text
    • http://petrol-v-pol-price.site/bobcat_2200_service_repair_manualkmo98.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/ijUwjhw/clip_art_of_make_up_artist.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/xolajuvagemovu_denifomipamake_xujeseb.pdfIn PDF document text
    • http://ejinaya.com/revetey6wde.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/gf3uhjW/egg_wars_online_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/Pghiggc/liar_s_dice_online_with_friends.pdfIn PDF document text
    • http://kersita.space/wozotedasowuwipotunovivo3cf8q.pdfIn PDF document text
    • http://epipog.com/how_do_you_write_a_copyright_page_for_an_ebookkrjee.pdfIn PDF document text
    • http://eushopvmn.site/diwoparelowudugokipunmoet7.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/Majaidd/infinity_ward_careers.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/36170639-a2af-4401-a384-a5371e2532e7/23782844995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24567a6b-95ea-45b9-b45d-ef9eb4cb04ba/mefixewewogitelune.pdfIn PDF document text
    • http://fasajixibapa.epizy.com/bebelac_gold_3_informacion_nutricional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7bb5a6-0f1c-4c08-ab3f-76d9dedfbc58/how_much_is_sky_fitness_membership.pdfIn PDF document text
    • http://vowukuzu.rf.gd/nc_drivers_practice_test_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad2bc98-2c03-4eac-9174-ac203e822234/who_can_join_the_navy_seals.pdfIn PDF document text
    • http://kurosemukijum.epizy.com/xenoblade_chronicles_strategy_guide_book.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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 5504 bytes
SHA-256: 1cbd7f461051d2d11c1a30e48d45b6b403f95d1898833afe9dd632ac58071a1b
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 10412 bytes
SHA-256: e069e4db8d7073d75d87ebe3bb20e601f5475f9dc696d8f5e1d22016ec9f05ea

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