Malicious PDF — malware analysis report

Static analysis result for SHA-256 c213e3d183814f20…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 21:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c91d2ea55e603e496b1b12578b04799 SHA-1: 20dab5b30c6ba0ad65c6fddbc85e4b7b6acd4460 SHA-256: c213e3d183814f2085f082e80d9f7ac3132fb8d93f7e939f7a9324d6c0b8c830
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 0.9995

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://druttle.ru/123?utm_term=spain+weather+report+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450043/normal_60159fc7bda96.pdfIn PDF document text
    • http://monstergym.ru/increasing_the_human_lifespanqjz71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5fcba59ec5815.pdfIn PDF document text
    • http://trenolgia.buzz/windows_7_loader_2.2_2_megalij5u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_600b36d98aff8.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/arcoxia_60_mg_bula.pdfIn PDF document text
    • http://stroymarketmetal.ru/93596631358u04uk.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/job_application_letter_examples_free.pdfIn PDF document text
    • http://itverys.space/how_to_change_time_on_timex_ironman_watchncqw8.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/19339285219.pdfIn PDF document text
    • http://mbfsopg.com/how_to_install_scroll_saw_bladezufs8.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/rufopulak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_c4ebfbd6fd5f43d584668c5417203d38.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_572c7fdadc1e4c8c9fb5568732bee1c6.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_a2dd8c697f384b50bd477ae8ed4f44e2.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_9fb23094a6e0496a94bebbea50bd5d75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecc93ad-5bc3-45d4-bc1e-b33946359a1a/what_does_a_ul_listing_mean.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_4e2a13782b874315bdf5a9537c4baf82.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_7d37f52cec784b8ea7b0448e9077a230.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd20c49-87c4-4dcb-9ba0-262b962a9a85/potudusakulilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4179ebb0-15be-495c-9349-aae05672bb55/hamlet_discussion_questions_act_1_scene_2.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_10f16025c3ef47569d856c968dc3678f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 4284 bytes
SHA-256: 8eba4b924498d986b45efbd3fa69d4907ed3ccf2d3d72a45bff3ba34ab090a64
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 5132 bytes
SHA-256: 6f1d52e8baa976b3e8e5a50f950865ce04be731e8577fd16a1a5ccaafa4df37d
font_02_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 12752 bytes
SHA-256: a38ff7d7f22de9d1f074ac3580f0d1aba76d212e4f471f79fde34d0883a7eee4