Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb26f11d08a8fc4a…

MALICIOUS

PDF

96.4 KB Created: 2021-01-10 23:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7993f52492158f6a56c08682ae2c316b SHA-1: 164bdd509b357eed39e41059566b683aa4a4fa9c SHA-256: fb26f11d08a8fc4a7f40f06bb96347ccd9708b9ae3c496e27986a0685a79d9ef
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of embedded links, many of which point to redirector infrastructure or link farms, indicating a probable phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffine.ru/123?utm_term=family+life+now+2nd+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd0d9a2423e2.pdfIn PDF document text
    • https://jijejadu.weebly.com/uploads/1/3/2/6/132683218/5472197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5fcd352e24ecc.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/d5d0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fc6409819790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f8f635767fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fc6d81ef2475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fb843609cf3e.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/f6S1hc0/wolesoderirifudewilevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fa8765248619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_5fc294e2b839c.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/radubozufiwo/93960727427.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/hs_code_china.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_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 5192 bytes
SHA-256: 9ea92bc1f710d00dba4215ba0dedce760dad5a803f02fa3814fae4c88f293442
font_01_sfnt_off00014fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBF 10884 bytes
SHA-256: 7eec81bc8b586bab9ce4aa0bc00ea61b80c28a5b52a58081b2344fbea5952d10

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