Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf9ed205a715d08…

MALICIOUS

PDF

86.4 KB Created: 2021-05-20 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e99df14d5d320591a5315b700f46af6 SHA-1: 7447f68d624209683276482269fbf2f426e5e427 SHA-256: ccf9ed205a715d085e12ea14fca37eb24165575b6a3bde79e7483d1a8829095c
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 hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=good+sam+dinghy+towing+guide+2020 PDF link annotation
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/davasetar.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/lotirobemob.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/c012398aeb50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_600c6ed20886a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_605798c608e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_604d942734dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_6041eb8651a91.pdfIn PDF document text
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/bigekawakoka_xagofa_midivafi_fonaniletikipu.pdfIn PDF document text
    • https://jawozaker.weebly.com/uploads/1/3/4/5/134511221/f3e1d964.pdfIn PDF document text
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/jibasop_sixuzesum_wimejamasiritok_vapopoxe.pdfIn PDF document text
    • https://pubixewamobuvu.weebly.com/uploads/1/3/7/5/137515712/bcac054.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/6961443.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/bazogoj_pijigefadumu_jobirisesufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_60044b003a3bd.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/53a2e88a-bdec-4958-b3e8-48624bf1a3c1/32645370250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012f8fe3-8d00-4f6b-a906-efa6025090a8/54664446987.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/linfadenitis_mesenterica_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866de2ed-bc9c-4bbc-9ff9-4e977f7df6b5/our_night_out_phoenixville.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/24410687688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe54dfee-d049-464a-8957-20896b08c232/77870771425.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/wedding_landing_page_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b70c7dd-c201-4252-b963-f52b12e7625f/96004579866.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/36455406898.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/vunakotobep.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/cerere_eliberare_pasaport_2019.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_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 5612 bytes
SHA-256: 442b8de83bf902b47a74befeaf9d946ef0021cecd0adc4572e1b8841bc07f1eb
font_01_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 11616 bytes
SHA-256: e70d2df7a18078d8137fade829fb85fa5684953ea5af5f41910cdcc3fd1ca984