Malicious PDF — malware analysis report

Static analysis result for SHA-256 1465f6cf565afa7c…

MALICIOUS

PDF

74.7 KB Created: 2021-06-04 05:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b174c7afe804cf3906aa098f3803332d SHA-1: 4a851b53fa3cd9112df790c3806ca9287ccefb3c SHA-256: 1465f6cf565afa7c5bdfccc4c4c871842788e40560ef9bceca6b33d0f38990d2
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 domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/pbw?utm_term=how+to+write+a+concert+report+for+jazz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380545/normal_604018d599208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5fc9c2d52b7ab.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/temeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487897/normal_602100ede6302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_60386d915534d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4377098/normal_60b0b47c51790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368475/normal_5ff79cc570b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_602244b360a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_6056ccf58b7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_60606818c9d1c.pdfIn PDF document text
    • https://pilovezodono.weebly.com/uploads/1/3/4/3/134313857/peladarikoposes.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481270/normal_60affefdbc2bc.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/d2bbc6cb-5328-4b7e-8c2c-5ebf8536a4c9/19101825388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70aad020-b2d7-4cc9-92f6-c88b22a2d884/kokusanejivor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a23541f-8361-4815-b0c6-7a5fbf0662e7/44205052173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e5c395-c6a2-4e69-bcce-9260706f66df/zivepejemavubupowuxenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9611e1b7-6e8f-46c5-b8c6-7e7067a9dac3/gireropaladurix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17f289e-40d3-49af-8585-c2509736316f/sherlock_holmes_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912619f0-7bf5-4db1-9ca1-22f0215f59bd/munoralaf.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/f/zona_de_desarrollo_proximo_y_andamiaje.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/what_to_add_to_smoothie_for_weight_gain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f16b0c-fe34-4a7b-9fa1-07a6d3a2a767/71893863241.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/w/file/fetch/144585129/4245617708.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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 4980 bytes
SHA-256: e38aa89669b80cc1fc81f3a2e11116b73abcf205a58eec448e8c8eca2b159995
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 10236 bytes
SHA-256: c546bc0058e3bb7aab33761ac967fa046b9de3c29796a3a8279461dfeb75b190