Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f146079c677ed5…

MALICIOUS

PDF

107.1 KB Created: 2021-04-05 15:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e1c041aea54061a9d5098a935b70a9cb SHA-1: 69e46e5e635276e818954d0d67f9c4b7e04bb12d SHA-256: 99f146079c677ed5c0edb0698b4c16baa2eec0c9927302b499697b8f1df95d01
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or redirecting to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+play+the+game+of+life+adventures+edition+board+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493917/normal_5fd8a297d9bcd.pdfIn PDF document text
    • http://govitus.sportsontheweb.net/world_map_countries_black_and_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_605d7e443d876.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/ccat_practice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_606026516f4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_604980397d44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_604354c58042e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ffa7ae707ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_600bbabe4dc70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495858/normal_5fce3a881c3dd.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/9617853.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/8d15d208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_605fc0c1b8726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_6013b3852c414.pdfIn PDF document text
    • https://tovibimatajo.weebly.com/uploads/1/3/5/9/135963052/a16d024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_60415239a57f8.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/35548358482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6023dbbec5523.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/170988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_6059b211f223c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojibejo.epizy.com/manual_ceramic_burr_coffee_grinder_gr_283.pdfIn PDF document text
    • http://dipijiz.epizy.com/54738416162.pdfIn PDF document text
    • http://xasejumav.onlinewebshop.net/xunibarulifujolikezubi.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_off000163c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C6 5812 bytes
SHA-256: 5428eb4df1d8a02c5004a3b49d7b04e4897396b073cfddfd8fefdc8827338f36
font_01_sfnt_off0001777f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777F 11416 bytes
SHA-256: 5e80de470f11ca258d0aecc82a0dbf4048951405f1b6a6a6ea108390a23e9ddf