Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bc85fb21c0f230…

MALICIOUS

PDF

78.5 KB Created: 2021-02-24 02:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 27cb694b9c71cbd6771e9cc8d060474e SHA-1: dea863d2e49c9be76e2d8c09e3e20c4fde6c5130 SHA-256: a7bc85fb21c0f230d6cd72771d68cc0480b526a70ae68f63d504dc46e6bf28d6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm and malicious redirector suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=magicite+guide+ff6 In PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/netolejixedikoli.pdfIn PDF document text
    • http://zuxunolenodo.22web.org/bufuniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_60334a1e08205.pdfIn PDF document text
    • http://dolugonowavogo.iblogger.org/31901538664.pdfIn PDF document text
    • https://gonuxatokudegi.weebly.com/uploads/1/3/2/6/132695329/1876410.pdfIn PDF document text
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/4204388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fcaec948b614.pdfIn PDF document text
    • http://kixamugefuwa.22web.org/15364961117.pdfIn PDF document text
    • http://sorewoforami.22web.org/vevotolijavegazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6027f1887aedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_602c4c496a078.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/5d1078d66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefogozi.epizy.com/format_sublime_text_3.pdfIn PDF document text
    • http://zosenesewil.rf.gd/wewopowaxepazipuwanu.pdfIn PDF document text
    • http://gitakatad.epizy.com/10466947368.pdfIn PDF document text
    • http://relurifiluxel.epizy.com/content_plan_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/jajeributuvipajesulafaro.pdfIn PDF document text
    • http://moxurux.epizy.com/pupode.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/rawajavenuxirepanija.pdfIn PDF document text
    • http://vipaviveza.epizy.com/72500318323.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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 3512 bytes
SHA-256: 0666db4f06b8b9a724bcb1884784fbd0f4b818c46baa182cdcbd163f8baf9b27
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 5044 bytes
SHA-256: 135ccd32f1a80b66aaaef9b60daa3605ca261875ebb85a96912dafd49f8a643b
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10460 bytes
SHA-256: 9aadf8b392d78f682f954fcc71e453619d8e3ba5b0fac59bb8c4333e54907c4b

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