Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd021c18a4eb4f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-29 14:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258d4a49b1adc05bfbf8378e916eb93f SHA-1: 8a9b577cffb110a21e9f0a02668b435a676383d2 SHA-256: 19fd021c18a4eb4f12b64a21d06487c8b129b7daf212c49292f51aa28a8362e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The document contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=persuasive+speech+sample+pdf
    • https://vuzabevewipa.weebly.com/uploads/1/3/6/0/136087677/159e214.pdf
    • https://cdn.sqhk.co/kajurineg/jhbYjdJ/jurassic_survival_island_evolve_pro_mod_apk.pdf
    • https://cdn.sqhk.co/wadusazilox/dSIjaha/24753260723.pdf
    • https://cdn.sqhk.co/mesodimeduje/XKTx4qb/lmfao_meaning_urban_dictionary.pdf
    • https://cdn.sqhk.co/tobepeliv/bjigc0r/55937909328.pdf
    • https://cdn.sqhk.co/panazomuv/cigXhiW/xobofedi.pdf
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/wosine.pdf
    • https://cdn.sqhk.co/lokiwejawe/heickjh/ufc_254_uk_time.pdf
    • https://cdn.sqhk.co/xekawiba/dis4jfM/leapfrog_game_system_for_sale.pdf
    • https://cdn.sqhk.co/rogotojuseb/cggPZig/gomuwajeter.pdf
    • http://hookup750.website/happy_birthday_music_sheetodpvw.pdf
    • http://umdtheatre.ru/77364570941lebr3.pdf
    • http://cozyplacefor.rest/autocad_keyboard_commands_changext7et.pdf
    • https://cdn.sqhk.co/vujaderaz/jgrgiJY/english_football_champions_league_results.pdf
    • https://foxogitasi.weebly.com/uploads/1/3/2/7/132740511/zuziwiwuxarelaw.pdf
    • https://cdn.sqhk.co/patagarinixa/jb281ZJ/dictionary_online_english_to_sinhala.pdf
    • https://cdn.sqhk.co/letopoto/jhjjheo/top_hits_songs_2020_list.pdf
    • https://cdn.sqhk.co/litonesi/jd9hhj6/my_talking_tom_friends_download.pdf
    • https://cdn.sqhk.co/pakelabete/ijmhdcx/66421640821.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/051f5fe3-8602-4b27-a816-c7d06753a268/sears_gt6000_garden_tractor.pdf
    • https://uploads.strikinglycdn.com/files/db975370-3a10-4ab6-8c15-61fd7d9bf179/95190625227.pdf
    • https://uploads.strikinglycdn.com/files/16653082-cc1e-42a1-97d0-f8cf53c8dd5d/simiwisifon.pdf
    • https://uploads.strikinglycdn.com/files/08a96a44-acbe-45af-b2b7-c119124b63b1/how_do_i_replace_a_lost_drivers_license_in_massachusetts.pdf
    • https://uploads.strikinglycdn.com/files/5612d71f-0350-4570-9599-cee018f65275/dell_e5400_laptop_weight.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e0.bin
46561849a2f60c9ce4294047b440f7fa975919198ec561c38d13488f56be8643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 5456 bytes
font_01_sfnt_off00010b50.bin
9fe1116231f01f933d3277c4c909e7522d40fc4e3df421e5d05c5535897cb1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 10184 bytes

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