Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d24832036d0dc1…

MALICIOUS

PDF

73.8 KB Created: 2021-06-06 08:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d8fb59b5a0939e15ec7767e9ea795606 SHA-1: ecc8b57a7641567ab1f7086c8219e898040eccc7 SHA-256: f7d24832036d0dc16c51f032918fe2a7d45585c5a613a5b50abec6d44f8cc505
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/pbw?utm_term=vocalise+rachmaninoff+kocsis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fc7f727dee1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fe2c14975f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5feb83d74422d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_603d0333de4c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_60183db5279ec.pdfIn PDF document text
    • https://poxanada.weebly.com/uploads/1/3/1/4/131483305/lurufaxedu_jasilogaluvoj_giwusanetulinop_nodasemuwezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_601bbd8b16f84.pdfIn PDF document text
    • https://xurexesezegurez.weebly.com/uploads/1/3/4/0/134096141/lulevilajovakakom.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/xenonejiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5feba50990ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5fdb97d51624e.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/wanoxikezapibox-pibomadimeravak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6068569c64081.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/f520dabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5fcfb32f0a913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_5fd6d2789c0d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_60410e6ed8811.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/72dc6dc0-9bdc-4321-a589-52756708f98d/79370741852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb68978b-59c6-41cc-94d7-f526521394c2/palabras_desordenadas_para_ordenar_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bdc184-8891-41c5-b0b4-07576a0ab34a/google_play_store_free_download_for_huawei.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99514d11-a544-4c7f-89dd-6d617f4b0b9e/40990957674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7df00c-90e1-4a53-aa5f-e15f33eea2ab/what_is_the_best_app_for_college_algebra.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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 5424 bytes
SHA-256: e09c75042b52389c65055f12846e2a4b1881a2680d25fd02278e921af606c11a
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 11744 bytes
SHA-256: 53a74f6082bd712964a589ca981ecd663cc89da62af2d339ed3cadcda3cb0885