Malicious PDF — malware analysis report

Static analysis result for SHA-256 c413bc8e58fff8f4…

MALICIOUS

PDF

80.9 KB Created: 2021-05-02 15:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f064ce95a7e5e940f721b76c1385b88c SHA-1: 9a4f2663462f29c5126bc1dfc2c6b6e9e146729f SHA-256: c413bc8e58fff8f49c57f1c7538508d71187c8f8599777f53fd831ad54f279d1
186 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one URL specifically mentioning a printer service error. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust by presenting a fake technical issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=hp+officejet+pro+8600+web+services+could+not+be+enabled PDF link annotation
    • http://joweponula.mywebcommunity.org/tunezasekajibatiwez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_606cd335f22cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6047c7f69f4d7.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/77a420d559dc72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fe2d283ceffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_605ef488a7240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_606dcbc4c00a3.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/reading_articles_for_ielts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5fe6d7fa8c372.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/bbc_compacta_class_11_english_solutions.pdfIn PDF document text
    • https://mijolepeworid.weebly.com/uploads/1/3/5/3/135394353/5158019.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/8608353.pdfIn PDF document text
    • https://wirejosesem.weebly.com/uploads/1/3/1/8/131856641/jowusul-fezazuvajagufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fda92e5e91ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_601cbc045b7c7.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/8be0f625-9e00-4077-9898-b6758bb73fe3/book_report_template_for_3rd_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/javonitatote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cef566-2dc6-4064-aa40-6acb6736076d/the_man_in_the_high_castle_netflix_italia.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/84880982195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebc382e-b5f8-4be7-b10c-222aca636a1b/duluv.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/85413214708.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5968 bytes
SHA-256: 3e5a13e84238f7ddd96c4bc098e148a4ecac10c57826180ebf0226af1fcc972a
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 11424 bytes
SHA-256: 811c132a1b93d31dd23bda37d761419ae7039fa15cae2eeb1c0108d3796b8c04