Malicious PDF — malware analysis report

Static analysis result for SHA-256 3907bc5d507de7fe…

MALICIOUS

PDF

84.4 KB Created: 2021-03-28 22:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9541b8a60d6be892dab091a714243ed6 SHA-1: c63ffed973da7dee859332106186002b11c6ccba SHA-256: 3907bc5d507de7fe5079da8f07a7b5d5fd745cd92a0f7c27c1fe5b1b23d1a165
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary URL, 'https://seumenha.ru/wix?keyword=mysql+5.7+reference+manual+pdf', suggests a potential SEO manipulation tactic or a lure for users searching for specific documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these linked resources.

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://seumenha.ru/wix?keyword=mysql+5.7+reference+manual+pdf PDF link annotation
    • http://vitrinachel.ru/gijote0olvn.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/hbhhbja/jagotuzekepejokenib.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/giqNghD/la_times_crossword_puzzles_mensa.pdfIn PDF document text
    • http://file-id.ru/vmc_treble_hook_replacement_guideuz0wn.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/ejcPibw/91125129840.pdfIn PDF document text
    • http://gloslides.com/xexoxajere324xd.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/6818edc5-8366-4313-9ffb-f09c4c346ba9/spyhunter_4_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5e2574-d6b4-4556-8f24-d55cbed757bd/how_to_sharpen_chainsaw_stihl.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_c3eec01cfe66450fa011841cc63382db.pdf?index=trueIn PDF document text
    • http://ramufezumax.rf.gd/vobaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92858579-8f16-49a7-8a65-c79b40a21d9a/dod_pki_program_management_office.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06491f7-3108-418f-9aa9-307d5a99f814/how_old_should_you_be_to_read_warrior_cats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7948de47-ca5b-4d40-a198-09430a777b45/how_to_connect_propresenter_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f318224e-ee8f-4447-a239-ece2dfc7df8b/la_odisea_resumen_corto.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_63a826543627460694673789edbccc7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2845c7-4551-42ed-a38a-c0862a59d10e/how_to_reset_a_lg_headset_hbs_750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec66c80-8363-479b-95a6-ca859dc1b929/nunoja.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/arena_of_valor_taiwan_apk.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2b9ad96f5b1146ec9c07be8aa77c0970.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_ece14b04d53e4f27a2df6790d37bb25a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 3080 bytes
SHA-256: 8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b
font_01_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 5772 bytes
SHA-256: 4f77ab5d023b1c5616128698359df1507cc60616f48ddf2c98204ca307aa5363
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10908 bytes
SHA-256: 9b75373a18ca5517e09f466323f660e858f74700e9b87bb715955689f16f9a5e