Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4c4d1f07cf0cf5…

MALICIOUS

PDF

69.7 KB Created: 2020-11-19 19:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bc1a0a294db8ddc2839cef54cf2bd01d SHA-1: 14e5d60423d5bc61add5ffc47e81c0ead7c68ec0 SHA-256: 3b4c4d1f07cf0cf5fad94b5158170dd8d973562255fb35db0310261acbba1e7d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to direct users to potentially harmful content or phishing sites. The embedded URLs and the nature of the link farm indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffi.ru/123?utm_term=prefijos+en+espanol+para+ninos PDF link annotation
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/9eb71c665f.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/9266d.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/61652be7059c.pdfIn PDF document text
    • https://bavawodefa.weebly.com/uploads/1/3/4/4/134445913/95272e67500.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/sujezegodib-jimuxedowutepij-lufumuji-tavisekuwas.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/aaa28a43.pdfIn PDF document text
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/215804.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/d4eccc66e66e039.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/vidagi_tutegafururij_fefevujapixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9215db47-65cb-45f0-9230-82c65ea41779/adjectif_allemand_liste.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/wetunawexezekagosikin.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/arabische_tastatur_chip.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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 4972 bytes
SHA-256: 70a1b833ca828c56c82126fbbd19e32754a089abd5bb5d47beb0a5a05b75ccaf
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 11180 bytes
SHA-256: ad99b369f79afba0a4ad227ac70cb47f7c151c74f1bc830294887ded6a436953

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