Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb870c4fd54af11…

MALICIOUS

PDF

75.2 KB Created: 2021-02-27 22:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a4b6ff9948f9c8dccb2a9dd14184f42b SHA-1: a07670621875a8833f359b08ed896ff8d6d6dbd9 SHA-256: fdb870c4fd54af11f45ad5e1a1c58c83bf1ff21d9e2fb8b936a1dff09dd0054f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains or suspicious subdomains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a compromised or malicious site. No scripts were extracted from this sample, but the overall structure and URL distribution are consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=public+relations+major+university+of+oregon PDF link annotation
    • http://bigonetudukori.iblogger.org/19091588292.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/d4idhjd/slack_stock_price_target.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/GficjfO/video_maker_online_free_for_birthday.pdfIn PDF document text
    • http://doniposebuk.iblogger.org/bhoot_wali_movie_full_hd.pdfIn PDF document text
    • http://liruroz.iblogger.org/dragon_ball_super_manga_listado.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/mBjhZ0k/30420442303.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/h7ggcyp/bb_racing_unlimited_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/Zgfgdgd/baby_alive_grow_up_doll_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/eUiiiff/b2_guide_luigi_s_mansion_3.pdfIn PDF document text
    • http://kigujawogusufiz.22web.org/feelings_needs_list_nvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobunedofakane.rf.gd/router_guide_bush.pdfIn PDF document text
    • http://fipomazuwasa.epizy.com/cellular_respiration_steps_worksheet_answers.pdfIn PDF document text
    • http://zopimubusa.rf.gd/boy_scouts_of_america_lawsuit_lawyers.pdfIn PDF document text
    • http://gurajitobad.rf.gd/guns_germs_and_steel_chapter_19_summary.pdfIn PDF document text
    • http://jujewejono.epizy.com/madizasupedutarodokek.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 5580 bytes
SHA-256: a8b3f9dfe8c3225b5eda02c4e98ec70cc18c6b8f1a679725e503cc4eb62d6abb
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 11092 bytes
SHA-256: 0b9e8f8e96157256a889fe9f48f161e76175415e14ea1fa19abf4dd63c70c95f

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