Malicious PDF — malware analysis report

Static analysis result for SHA-256 84af22060f36c841…

MALICIOUS

PDF

96.8 KB Created: 2021-05-28 13:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f76436fb72b320946cd091feaf34fed4 SHA-1: 8526012a710a34a7cf211887e0cf7d5ad79d5084 SHA-256: 84af22060f36c84144f2d7bb95317892904153aed37a55ca90fdeab30e7bf655
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=realidades+1+capitulo+5a+actividad+6+audio+answers PDF link annotation
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/d488beb0.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/nekemowaf.pdfIn PDF document text
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/6aac78f84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6026f9305d971.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/gokomo.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/tazedibizuzamik-zakavagix-mefamivibapox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6006564058c23.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/fejofesajoguta-fotewanopozob-kejota-mutafotojajo.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/632d671a549571f.pdfIn PDF document text
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/sajave.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/taxugezorule.pdfIn PDF document text
    • https://sorizovebikup.weebly.com/uploads/1/3/5/3/135386894/verezif.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/kasovom_samodopawelul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_606c25faaabf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_6059e90b3430e.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/4c26b03.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/b5aa9bdddfbc6ae.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/5834801.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/8fe30ef6-5315-4c0e-90e5-867c22bb9a5c/after_chapitre_2_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e92fdf5-6c46-4d49-817b-34b95e6ef5c1/53720624501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9446f8-5290-4c3d-8f60-dff14420527d/thought_meaning_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7f54b3-e6f0-4ec7-8e79-09f85b833bc1/1332953571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e1b373-da04-48fb-a535-c9fe0ae340ae/85387187549.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_off00013be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE4 5556 bytes
SHA-256: ee5b668ce9a60a7274487879c3887a334fc6ca99f95b9da77076a3d8adc965de
font_01_sfnt_off00014efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFA 11564 bytes
SHA-256: ea8f20d059570a88120c1fa65ea01726b012e08907f5ab6ca9e9378c4a7f53aa