Malicious PDF — malware analysis report

Static analysis result for SHA-256 80669e755602a01a…

MALICIOUS

PDF

88.9 KB Created: 2021-03-24 12:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52748cf4df644e7b2dd6853c8c3dc58 SHA-1: d4ccef5e5d454eb1756f7f73fa0fe31b3c64adeb SHA-256: 80669e755602a01a7dce4c13d7294ba458c40e903369edc4f6fd7cede80465c7
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. Many of these links point to domains that appear to be part of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=activity+based+costing+kaplan+pdf
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/b165238d5a78d3.pdf
    • https://cdn.sqhk.co/sawibevas/ha6SOih/30221524579.pdf
    • http://barashik.space/123_pattern_indicatorhstlt.pdf
    • https://cdn.sqhk.co/sedazozesufu/jbwLvic/lapadafojasenexikesam.pdf
    • http://gikadoketu.iblogger.org/nifanujozezodomigema.pdf
    • http://upsbox.ru/android_folder_url35wcs.pdf
    • http://jiguvesowa.22web.org/easy_recipes_for_beginners_vegetarian.pdf
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/dafufipiwi.pdf
    • http://storeplus.info/37098642523v1kmd.pdf
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/sadov.pdf
    • http://copyright-helps-team.com/how_to_follow_agile_methodology_in_project19p4h.pdf
    • http://tehnotop.site/adobe_cs8_master_collection_free_dowjzcwt.pdf
    • https://vawixufedal.weebly.com/uploads/1/3/0/8/130814584/ef25c987ba6b.pdf
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/b56ed8e51f240.pdf
    • https://cdn.sqhk.co/tusadopovet/eibfHCp/kanto_pokedex_serebii_let_s_go.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34faf3ff-6da8-4966-b31e-6534230da0dd/defending_jacob_who_killed_ben_in_the_book.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_63eea10312c346c08e29750413e5a1c7.pdf?index=true
    • http://kutifakibidi.rf.gd/27677997602.pdf
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_b2a6b2fcfc22496abca9e645b331857a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c10b3858-0c10-43ef-bc5b-11a326aff52a/39727333036.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_1e0137acc93347bba1ccda1078d1d2f8.pdf?index=true
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_a89c6eea01514f5c99a8fd66fdbc8b46.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dcb.bin
a945dc946471c5f29ddf1512e54317dc6feb76878ddc629a00aad4e07c336fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 5584 bytes
font_01_sfnt_off00013100.bin
8eec0a8449031db2840856b506225cdbb21c1156f2fa23579a30fb6624a2b1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 11148 bytes

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