Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64a5ca82c2f7625…

MALICIOUS

PDF

71.6 KB Created: 2021-04-06 07:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3bc36ff13549f08671e04390c984aa74 SHA-1: 257e024bef584d4f3c43844f0cff1ffb28eb96ed SHA-256: e64a5ca82c2f7625594f27f0272abafdca0fdbc357dfef134401451b19570a3f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/strik?utm_term=samsung+rf267aers+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6044c9b81a7d0.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/5597404.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/fezugaguvow-rerupuxe-belifovalata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_60370f6a9a9dc.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/jofegonakemigafi.pdfIn PDF document text
    • https://mizazilat.weebly.com/uploads/1/3/4/5/134528341/ziralogax-xesuxegera.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/7554011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_6049f86c734eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_60377b2883902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_526fc627682e4afb8a57c7eb67876d70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c3a937-5a70-4c63-b3b2-ab01dd3e3818/how_many_dark_souls_3_dlcs_are_there.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/carcereiros_1_temporada.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_93740180a0c04531b2d67ac6d9e59f38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5114c9-076b-4f68-9534-77a25f596f18/examen_de_comunicacion_tipo_ece_para_tercer_grado.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_42f7df7a51764da99aa9181ff419663f.pdf?index=trueIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_e04dd80b2b564bb5b80a93afb29474e7.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_f7f085a1171f405baff9c03fadc26bc8.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_070c6b7a267d4b8f84a80628606c6e40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/winumigutam/husqvarna_445_chainsaw_best_price.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_58b737376a3b460ea541d2b4a8f12a30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a16122-f7e9-471e-93bd-7b29548fcab4/zazuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27cf8685-d9b4-4deb-980c-4b0ea5fff614/vikij.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_20815bedd4d34571838f28d6419b3182.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/birthday_collage_template_online.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_6cf137ee6358494ea3fdce74333b0ebc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df743d0b-c0f2-4135-b400-c024d2923ab6/crochet_patterns_for_hat_and_scarf_sets.pdfIn 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_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 5772 bytes
SHA-256: 4e5050ea2d0b8e46f79753f40c4d7a0141368cb7c82a7bc7c53e31ce64bb2878
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 11100 bytes
SHA-256: df01d9b10701e578f83c9fbb6d9ed63128dc56edb57471cff19a89a560c6537f

Open this report in the interactive analyzer, or submit your own file for analysis.