Malicious PDF — malware analysis report

Static analysis result for SHA-256 8970b20ce58df5f4…

MALICIOUS

PDF

75.0 KB Created: 2021-04-27 20:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7cf486d9a554939bd42e6b8ed046fa4 SHA-1: e9da73e795a5564e48c41d0ecc14f3ead9bfde67 SHA-256: 8970b20ce58df5f4b7e3353528af8a7d70feae49ddb655be74c1af2dcf10e91d
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external URIs and the PDF structure itself suggest it's designed to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=what+is+alliteration+in+annabel+lee
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/xojagilememafexe.pdf
    • https://cdn-cms.f-static.net/uploads/4459941/normal_5fd9b2c28e38a.pdf
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/tipipesu_turilagebumil_pesekevexosete_dikasidikegobe.pdf
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/5944027.pdf
    • https://cdn-cms.f-static.net/uploads/4480149/normal_60640bf10b302.pdf
    • https://muzobaxokeze.weebly.com/uploads/1/3/2/6/132682229/880753.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f7e04d37-98e7-41f9-a6a3-6f87214c1b12/7574628830.pdf
    • http://xumomevafuvozup.rf.gd/bhairava_tamil_full_movie_video.pdf
    • http://febarufowit.epizy.com/60897758669.pdf
    • http://lalowaxe.epizy.com/metallica_nothing_else_matters_lyrics.pdf
    • http://minudiginodege.epizy.com/87937544826.pdf
    • https://uploads.strikinglycdn.com/files/4fd0aa50-69d7-4154-9662-4da98816ad68/fapijepegigan.pdf
    • https://uploads.strikinglycdn.com/files/7276be4f-f39f-494c-be8d-0ab98dcd2750/what_is_the_best_aperture_for_night_photography.pdf
    • http://xakixezusasop.epizy.com/riwaniziruwidamop.pdf
    • https://uploads.strikinglycdn.com/files/a0fd7f3f-58a6-44f3-ac84-7b6e4538f466/54507532367.pdf
    • https://uploads.strikinglycdn.com/files/76b5d283-7e1e-4365-a00a-f8f7cf4e12ef/vuxeso.pdf
    • http://sosefaxerutujax.rf.gd/offline_barcode_generator_software_free.pdf
    • https://uploads.strikinglycdn.com/files/83332070-eeeb-4e3f-9b60-f4a6fbd526d6/family_life_merit_badge_pamphlet_2019.pdf
    • https://uploads.strikinglycdn.com/files/3017324b-e6d0-4849-9bec-154998bb5ea1/69605389515.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_off0000e70f.bin
e231a4ad0ac87d1541009535ddba7bf2ea3909f8150c6876839347cf0dec3ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 4928 bytes
font_01_sfnt_off0000f7d2.bin
def5ba1697a1939b98808a44ffc39b58f9bc9f6325ad7977435e30a9de0d71bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 11420 bytes

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