Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc337269e8428df…

MALICIOUS

PDF

76.9 KB Created: 2021-05-02 09:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aada71240c16724ff7a95a1997d45cd9 SHA-1: 9d461b6fca335d8958f98833c646d9bb4279cbda SHA-256: acc337269e8428df224679f03c154c0f4891636a18a42fb91e59082a74f97b3f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/strik?utm_term=what+order+should+i+watch+the+marvel+movies+in+before+endgame PDF link annotation
    • https://dabosuze.weebly.com/uploads/1/3/2/6/132695252/476a317a0547.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/aprende_ingles_en_7_dias_descargar_gratis.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/giwegetafajepez.pdfIn PDF document text
    • https://zalamozosuk.weebly.com/uploads/1/3/6/0/136089451/4802728.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/75517035939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_982dd72b36dd46d69f7a13c7b8c30cce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e722216f-e18e-4545-9d2c-f24a9a50337b/wixupidepawatubitoxegilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefcb96c-6a91-4617-aaee-cdc19ccb21c9/what_are_the_three_types_of_conflict_in_literature.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_1066ec25c0284151a08e637933202a38.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_eb02b42d19ac4c2a9ddd804bf3692c79.pdf?index=trueIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/entrepreneur_magazine_south_africa.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_ff6811128f1643dfb0197d36a4fb1287.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f99304a-e416-4abd-b27b-182c2f1f1142/what_is_the_best_drill_bit_to_go_through_metal.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_1d0e769430e648578ab515aec2ae8584.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf578a1d-cbaf-4817-9786-9428a2e86b76/how_to_reset_epson_l210_ink_pad.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_5f3436b21078430da7e9b302a913f3c9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 5740 bytes
SHA-256: ca2bdd64005e3332a6e7170b37b304b63283ccec07633b3f637a5f8fa529a471
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 10840 bytes
SHA-256: 95b4dfd491ae067b67a7ba7a53ca6a83c3a77744c0723d4238d31b0aad9a9594