Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ce66cb36984a34…

MALICIOUS

PDF

85.2 KB Created: 2021-06-07 23:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 17e4dbca18d386fcc9659cce87dcf7f9 SHA-1: d85e0f3b6c43c475a042d7c4c3048e5218e06ef7 SHA-256: d7ce66cb36984a3415a60a761a27ac4d239f4c6b8b7159415d38a4f0686e0693
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=deutsch+lernen+b%25C3%25BCcher+pdf PDF link annotation
    • https://jadamoxor.weebly.com/uploads/1/3/5/3/135344742/xoxewer_xefosebi_xodiga.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/luvetiveguxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_602a090540c9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fc8c8ff5fb23.pdfIn PDF document text
    • https://rurajutudap.weebly.com/uploads/1/3/1/4/131437622/934866a702843.pdfIn PDF document text
    • https://nukafezika.weebly.com/uploads/1/3/4/5/134510633/kupenava-tatulope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5fe8fb5be05d0.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/2352723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_602fa13b35081.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/zogoxiruwu_worulirevim_katetizisosugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_600ce8e2e156d.pdfIn PDF document text
    • https://fegafedanopi.weebly.com/uploads/1/3/4/3/134311678/lolodusuzegavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_5feebc050a553.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/97c415d1-4884-4237-a7b6-eee308d93763/68593373512.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425118/krispy_kreme_donut_holes_nutrition_information.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/net_present_value_perpetuity_formula_excel.pdfIn PDF document text
    • http://subazim.pbworks.com/f/hosanna_in_the_highest_piano_sheet_music_free.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/vocabulary_packets_greek_and_latin_roots_unit_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4cf569-820a-46df-b3e7-098eef6051aa/fiat_punto_blaupunkt_radio_code_free.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/34406526778.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 5292 bytes
SHA-256: eeb30533798b55fad7a7691ebc27d10ca1cb81113bce04f2c7d11e9ed8991cad
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 11572 bytes
SHA-256: 9ab03bcf8f66834811523ee6c39194eda8e95653a8fb1a5b246c79795456dfcf
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1