Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5e7463cde06db1…

MALICIOUS

PDF

77.1 KB Created: 2021-03-26 11:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b5fcbe8aa98c0975a9fcd7373f946449 SHA-1: ec9265e8d34b05a48e4b76a2078640cb1672f949 SHA-256: 9c5e7463cde06db1dafbd3902c1f21b3c62b0a30304bb1cc6ec9cc615014b93a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, with several pointing to disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs further supports this attack pattern.

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://mezovuduw.ru/wix?keyword=your+name+characters+in+weathering+with+you+reddit PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://fomodefoz.weebly.com/uploads/1/3/5/9/135958111/ripujigemebe.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/79556834597.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/meroraxijixo.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/60ac29.pdfIn PDF document text
    • http://fegalaro.iblogger.org/eton_radio_frx3.pdfIn PDF document text
    • http://003-center.ru/295250667193q4ll.pdfIn PDF document text
    • http://wgathering.org/bilofugulifolexiouhfc.pdfIn PDF document text
    • http://alesyasemiletova.com/barrons_sat_chemistry_practice_test0zkul.pdfIn PDF document text
    • http://alkostore.xyz/can_you_do_pivot_tables_in_google_sheets6ter9.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/bf500323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_642221ec550c42559ebebf21f6b244be.pdf?index=trueIn PDF document text
    • http://gemakeruw.epizy.com/zafexalevadut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d596b4-2fdb-4099-9b7f-f831459f6d68/dremel_flex_shaft_attachment_model_961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef777c3b-9417-49ea-a078-c28f55e710c3/viking_range_repair_atlanta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f73a725-fec1-48ac-9b58-e1aab9c90de6/m-audio_keystation_88es_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654e9909-7e6b-4cf3-808b-52cf9dae1d19/sig_sauer_p938_manual.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_f52d7a51075143f691267bc7c6a842ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/452e92c8-2063-44a1-ab21-3eafb88e4fd5/en_que_consiste_el_nivel_de_lectura_inferencial.pdfIn PDF document text
    • http://sivebobaxibi.epizy.com/jquery_ajax_php_form_validation.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_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 5476 bytes
SHA-256: d4fa4fe8555fadd9538837ac03c16367296c3550dc7a3c0675216bbccc204342
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 11556 bytes
SHA-256: c0e40d1bcfa2404192bcfb4442ea521b4bcf6be243642d47398cc2edcff0ab1d