Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b6d2168149572f…

MALICIOUS

PDF

69.6 KB Created: 2021-02-26 17:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fc82a048f1df3365bec7709f35be97ca SHA-1: e8571dfb6a64d573dba75e24dc207ac04c9b9020 SHA-256: b1b6d2168149572f1a6eb1ca5454d1ca6745556762151ec2ac2ca76872f1e836
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to malicious sites.

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://leonvi.ru/strik?utm_term=kitchenaid+superba+double+oven+door+locked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5fdfab371fc5a.pdfIn PDF document text
    • http://fapadobitazi.22web.org/gezozumeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_600eb48a8e83f.pdfIn PDF document text
    • http://instapriz365.site/xuwiluxomobipagomoo4azd.pdfIn PDF document text
    • http://jusolul.22web.org/army_relation_bharti_2019_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_602286959884d.pdfIn PDF document text
    • http://sinagitozuram.22web.org/dozosituzigetibizile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_6009a2896d7ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tetexabe.epizy.com/zebagobekipowusireturoje.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/visusebamozexaju.pdfIn PDF document text
    • http://misukejijixuke.epizy.com/dukejusu.pdfIn PDF document text
    • http://badememaveg.rf.gd/62726265641.pdfIn PDF document text
    • http://gonaviniji.epizy.com/bavogojugazegogasukuwin.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/libugupimilu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/adonai_tamil_christian_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/23090339945.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_off0000c6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A4 5276 bytes
SHA-256: 46c9924dbf0285c67ae5e2baaf840c37147dd531d52f691088806b4d81975eea
font_01_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 10104 bytes
SHA-256: 49a1442ce2c09355e58698d516070eb5f46f6eeb0213b20f2899d07f6f328c87
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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