Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e627c487eeba8ef…

MALICIOUS

PDF

71.2 KB Created: 2021-03-12 04:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6b32a952e67ab8486cae12a5e16350fe SHA-1: 9845ae9d24d45abe4af45ee1886d154ebbdd3129 SHA-256: 2e627c487eeba8eff6004a843b615e42a0f0ac26a35a4f15faeee175c4e55be9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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
  • 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://soxebez.ru/award?keyword=new+english+file+elementary+teacher+s+book+pdf+descargar PDF link annotation
    • http://alex-chekalev.com/why_is_my_printer_not_printing_all_the_pageskfx7p.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/vorenupewegop_lobexu_dixizefaxibat.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/445682d65.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/nugiladaxhtlr5.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/6852576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_6015cf81de178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5ffdbe6a04d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd637a1a8025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6014b09caf0f8.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/luropi/46162928324.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_44c39f7c0abe4ebcb10bed0abdefbf5a.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_f0d373451984420c9c9f5a8778346005.pdf?index=trueIn PDF document text
    • http://jibogifimot.epizy.com/19539474247.pdfIn PDF document text
    • http://ritekarevo.rf.gd/74413380247.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_a62dd609137b4073ba1dd6e4321fc0bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/55167172953.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/jodimadaronagotifekob.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_9a3277cf09d641759d506aafe93a413b.pdf?index=trueIn 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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 5936 bytes
SHA-256: ea8cf3f0ad4214950701b49a16a318923d1c39e2f1478e4c35b370c6668e7580
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10628 bytes
SHA-256: ae3781b6c9078498d1dbb8118aaca88592282f9412230b658d4082e9a66f5ab5

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