Malicious PDF — malware analysis report

Static analysis result for SHA-256 8112aa66f2ec25ed…

MALICIOUS

PDF

106.8 KB Created: 2021-05-09 22:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c01bc63b8d220613801d6d71843c1b7f SHA-1: 772697f946f55c17d2f89f2d6db22bba5dfd7a7e SHA-256: 8112aa66f2ec25ed0be2cb48dd8d3a1764a959744d736dd40b51d05de5a225a7
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 hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://golowaki.ru/strik?utm_term=the+mortal+instruments+tv+show PDF link annotation
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/wobemolu_wogusixatisaxuv.pdfIn PDF document text
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/4d207ab9eb32.pdfIn PDF document text
    • https://cdn.sqhk.co/kakovavop/hfAWQib/vamadibolunus.pdfIn PDF document text
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/rumusoduvodi-puvova-tilajejawokikab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458856/normal_5ffa77b065ea5.pdfIn PDF document text
    • https://zugavugusalozi.weebly.com/uploads/1/3/0/7/130776271/kiporilipamidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_600b64cc14f88.pdfIn PDF document text
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/xumavotapas-ledebugawit-fenupabug.pdfIn PDF document text
    • https://lusukukupesakub.weebly.com/uploads/1/3/0/8/130815137/baxole.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/heFieic/40257433982.pdfIn PDF document text
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/262ad2b20c7.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/m0gcGPq/kujitugowa.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/7219e1b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kunagukojoxu/JOeC2hf/vimop.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/ajbBhcZ/ark_survival_evolved_update_size.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/free_download_tableau_desktop_32_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_606abfeb0e3da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fdc7bcb75996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepizevut.atwebpages.com/physics_for_class_9_sindh_textbook_board_download.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/36109918301.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/kuwiniro.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/convert_to_word_docx_file.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/49697358186.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/common_and_proper_nouns_worksheets_for_grade_3_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/tubulesulino.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/38223728530.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_off00016383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16383 5028 bytes
SHA-256: 79c7e2d274d3c26f8434bb4a5a60c890d28b8a72a352a3ccb8018e48af9b6736
font_01_sfnt_off0001747b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747B 12112 bytes
SHA-256: 5d53af294ac80ece16e3fc9f8c763a80d3b9fd91fbe960a176551151a971add3