Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fb578dd037fce5…

MALICIOUS

PDF

77.9 KB Created: 2021-02-12 21:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 5d30da064453ac83bb065896f7f9f305 SHA-1: 4f57250aba3dfce022ada31ce4a229c4da51595c SHA-256: b8fb578dd037fce5c1687963f785787790c20616e74167f8774453d6af0a7715
224 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially involving a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=panasonic+5.8+ghz+cordless+phone+answering+machine+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5fe158d52bef8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5fdde23b0b129.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/fb0fcc70a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fd344ee4a454.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/xonig_wiradovi.pdfIn PDF document text
    • http://4d-5d.com/question_bank_class_11_physicslgm2l.pdfIn PDF document text
    • http://characduwe.space/74604576398p9xjf.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/fifopoluvokurej.pdfIn PDF document text
    • http://realwockyc.info/94803478054hquy4.pdfIn PDF document text
    • http://gemobaraza.iblogger.org/assassination_rogue_guide.pdfIn PDF document text
    • http://legalvictory.group/49956829166nsbhv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_5fea0fa43e20d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412582/normal_60081dfd989c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molopafefo.rf.gd/funny_questions_and_answers_malayalam.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/tamil_to_english_conversation.pdfIn PDF document text
    • http://diwifesatikebak.epizy.com/canon_eos_70d_manual_focus.pdfIn PDF document text
    • http://fusikisedote.epizy.com/pufevesexeboxudig.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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 5980 bytes
SHA-256: 0149b01f36f7d07373fc8b6bf520db2c25d6cfaffa759e5711e585e47071bd8c
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 10592 bytes
SHA-256: 6051f8da84bddb2f3d119abe674afef61a3a49464d8422c510923fcfe9725961

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