Malicious PDF — malware analysis report

Static analysis result for SHA-256 736f8f719082c615…

MALICIOUS

PDF

92.5 KB Created: 2021-04-02 11:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb3f37be57ead1a17461a9e5f81ff51 SHA-1: 53ac5ab1ba9757e288b853cd5826dee44375bf9e SHA-256: 736f8f719082c615e17740383f59674b871ade4fd7a873a2b4f2c51787bd4e02
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as academic or technical documents, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=atomic+structure+engineering+chemistry+pdf
    • http://look-hotel.com/interpreting_line_graphs_worksheet_science65ivm.pdf
    • http://lupuneruw.iblogger.org/endocrine_system_worksheet_answers_section_c.pdf
    • http://nicepics.xyz/como_passar_um_arquivo_para2vkz9.pdf
    • http://bluebadgeapproval.com/sony_kdl40r510c_power_cordujb85.pdf
    • http://shopeuro.pro/vobezebataditebetadap8t64l.pdf
    • http://gnfcns.info/sifonatenii7l01.pdf
    • http://lazokiwumemo.mygamesonline.org/xiwelabijixupedabex.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_100bc181af9f453cb3f6b0c56973737f.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_9785f58d7fd84313affd1c89ed0ecf68.pdf?index=true
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_ebb1faf8b3984abd827277dfc3696fe2.pdf?index=true
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_a2489910d11e49e6b32c4e4b9dedb24a.pdf?index=true
    • https://s3.amazonaws.com/tamovagag/pathfinder_mummys_mask_players_guide.pdf
    • http://gekavitominugi.epizy.com/birthday_cake_with_name_and_photo.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_0ce13e6ac0ef43ae95309ab399554981.pdf?index=true
    • http://gukamapi.rf.gd/beatles_complete_chords.pdf
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_1388300c5e634851b1bbed711fcc6008.pdf?index=true
    • https://s3.amazonaws.com/wokesabisevo/dunkin_donuts_chocolate_glazed_donut_coffee_k_cups_nutrition.pdf
    • http://juwebud.epizy.com/vehicle_registration_information_kerala.pdf
    • http://kagijido.myartsonline.com/25586359711.pdf
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_de461e84efe641f59a49a3df346c8d70.pdf?index=true
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_ead61b7b43e74be7a42fcffe4880e233.pdf?index=true
    • https://s3.amazonaws.com/wemupajese/destiny_2_haunted_forest_guide_branch_9.pdf
    • http://jimarol.myartsonline.com/76344992260.pdf
    • https://s3.amazonaws.com/xozeb/without_remorse_trailer_espaol.pdf
    • http://mekavebij.epizy.com/xojilulo.pdf
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_6f9064a24f114a548b4e6f40ea60f370.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110d2.bin
c4defe5092b48ba6009504c2acaca23f25b4d686ee573a9b8a7b09f487cb2afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 1852 bytes
font_01_sfnt_off000119bf.bin
66af03a3893dbabf9733f97d18eefa8b927d477b566a8a0b9a756ad83c95d771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 5300 bytes
font_02_sfnt_off00012ba3.bin
ebfacfffb151f0cb1f8c4c93cb503385caa789e691361833ef4fe03976ffcc83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 11680 bytes
font_03_sfnt_off00015357.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15357 4324 bytes

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