Malicious PDF — malware analysis report

Static analysis result for SHA-256 1170172580b3202e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 10:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1def3ccc285c215ac5ba4cfdbe6ec821 SHA-1: f6d0ae9ea8da47f73eaad75f2205d6a0d06b0f2e SHA-256: 1170172580b3202e4bdc685d707c2a489f9586066a2137114a73545700ed5465
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, references 'Wendy's breakfast nutrition values', likely a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=wendy%2527s+breakfast+nutrition+values PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5ffd027bf0bc5.pdfIn PDF document text
    • http://bumaga.bz/bigasobomopijeka0q7sn.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/iaCgijd/80s_songs_with_dance_in_title.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6018a6e59adef.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/AsYhcjb/tipoju.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/livro_capites_de_areia_download.pdfIn PDF document text
    • http://contarinihome.com/90385259788xiho1.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/jabivibewuvovaxoloxoji.pdfIn PDF document text
    • https://cdn.sqhk.co/nujoxodove/21HK0gg/nebulous_agar._io_game.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/dd_dungeon_tiles_reincarnated_city_dungeons__dragons.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/idNhBNK/jadiwixotukikanigakawaf.pdfIn PDF document text
    • http://armlur.space/oh_whistle_and_ill_come_to_you_my_lad_summarysctll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_4b4410b0936e4f8fa1f7ba883e5d8b92.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_8b055ee7662b40748b4bd3eacdf78e6c.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_05e35839c7564440ab3cfb3b6cbbc727.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_b330a02ea3234069bf3f7db58fe65956.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_cc3e6590d24d40d2ac5d0a41b8d7a307.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/802ac64b-bb1c-479e-b9c5-64d4f36f2088/the_wind_in_the_willows_summary_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4870714-4b77-42c4-a647-79c66df30593/50537447149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c63684f-2448-4cf3-8d7f-0269b7cee6a3/36507583556.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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 5312 bytes
SHA-256: 7c237d9a0240edd042a69d175ac9ea4638f823f961be50abfcc12295770bb8b3
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10860 bytes
SHA-256: 9a023e0a34898a36b712a4518d59734862b498e5c162e2d46cf7df01808d3efd