Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf2a1930840aa92…

MALICIOUS

PDF

66.4 KB Created: 2021-02-14 02:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8bef13ab0dd2d2a9513af23921d798cf SHA-1: f55d4efdb983c0c6c35c810fba03c882381ab764 SHA-256: 8cf2a1930840aa92dc571a25ba121d5058b1dedc3c4629d57a85da3f47c1a3b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=nova+aesthetic+center+inc PDF link annotation
    • http://nefritthebestthing.site/rebigukiwazokotexejufwjjhh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_60025567de0dd.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/5850421.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/4843176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fe7859d3efe5.pdfIn PDF document text
    • http://repair-telefonov.ru/using_commas_worksheets_ks3egn7m.pdfIn PDF document text
    • http://ujjjrrrrr.space/passive_voice_complex_sentences_exercises3gkeq.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/3472602.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/free_porch_swing_frame_plansx44kn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff19d0157f7d.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/5729d.pdfIn PDF document text
    • http://eduha.online/42091624737vlgn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6022842482f97.pdfIn PDF document text
    • http://osthondroz.com/physics_and_politics_bagehot8mnl0.pdfIn PDF document text
    • http://stixlife.info/61231876816cepqt.pdfIn PDF document text
    • http://pedron.fun/rotational_symmetry_worksheets_grade_4q7c4w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/22896786995.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_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 4884 bytes
SHA-256: 04e7a60cb7f14625f8453e6f591e596fc801d1864b86448cce8fe954d29d501d
font_01_sfnt_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10520 bytes
SHA-256: 8daf5a9a0318d2d4c7d15f4b38232ab545a9954a63523210898e32078f15c7f5